对标签页执行脚本出现的问题
背景
需对当前活动页面执行脚本。但是却没有反应（想要从浏览器中脚本的执行结果）
使用的软件版本
| 浏览器 | ： | msedge 版本 100.0.1185.44 (正式版本) (64 位) |
| 消息代理 | ： | 已连接 1.32.8.0 |
| Quicker | ： | 已连接 1.32.8.0 |
已经检查内容
背景页面内容为空
log中记录到今天早上8点就没有了
把脚本复制到edge控制台中执行成功
```js
var script = document.createElement('script');
script.src = "https://unpkg.com/turndown/dist/turndown.js";
document.getElementsByTagName('head')[0].appendChild(script);
var script = document.createElement('script');
script.src = "https://unpkg.com/turndown-plugin-gfm/dist/turndown-plugin-gfm.js";
document.getElementsByTagName('head')[0].appendChild(script);
var TurndownService = (function () {
'use strict';
function extend (destination) {
for (var i = 1; i < arguments.length; i++) {
var source = arguments[i];
for (var key in source) {
if (source.hasOwnProperty(key)) destination[key] = source[key];
}
}
return destination
}
function repeat (character, count) {
return Array(count + 1).join(character)
}
var blockElements = [
'ADDRESS', 'ARTICLE', 'ASIDE', 'AUDIO', 'BLOCKQUOTE', 'BODY', 'CANVAS',
'CENTER', 'DD', 'DIR', 'DIV', 'DL', 'DT', 'FIELDSET', 'FIGCAPTION', 'FIGURE',
'FOOTER', 'FORM', 'FRAMESET', 'H1', 'H2', 'H3', 'H4', 'H5', 'H6', 'HEADER',
'HGROUP', 'HR', 'HTML', 'ISINDEX', 'LI', 'MAIN', 'MENU', 'NAV', 'NOFRAMES',
'NOSCRIPT', 'OL', 'OUTPUT', 'P', 'PRE', 'SECTION', 'TABLE', 'TBODY', 'TD',
'TFOOT', 'TH', 'THEAD', 'TR', 'UL'
];
function isBlock (node) {
return is(node, blockElements)
}
var voidElements = [
'AREA', 'BASE', 'BR', 'COL', 'COMMAND', 'EMBED', 'HR', 'IMG', 'INPUT',
'KEYGEN', 'LINK', 'META', 'PARAM', 'SOURCE', 'TRACK', 'WBR'
];
function isVoid (node) {
return is(node, voidElements)
}
function hasVoid (node) {
return has(node, voidElements)
}
var meaningfulWhenBlankElements = [
'A', 'TABLE', 'THEAD', 'TBODY', 'TFOOT', 'TH', 'TD', 'IFRAME', 'SCRIPT',
'AUDIO', 'VIDEO'
];
function isMeaningfulWhenBlank (node) {
return is(node, meaningfulWhenBlankElements)
}
function hasMeaningfulWhenBlank (node) {
return has(node, meaningfulWhenBlankElements)
}
function is (node, tagNames) {
return tagNames.indexOf(node.nodeName) >= 0
}
function has (node, tagNames) {
return (
node.getElementsByTagName &&
tagNames.some(function (tagName) {
return node.getElementsByTagName(tagName).length
})
)
}
var rules = {};
rules.paragraph = {
filter: 'p',
replacement: function (content) {
return '\n\n' + content + '\n\n'
}
};
rules.lineBreak = {
filter: 'br',
replacement: function (content, node, options) {
return options.br + '\n'
}
};
rules.heading = {
filter: ['h1', 'h2', 'h3', 'h4', 'h5', 'h6'],
replacement: function (content, node, options) {
var hLevel = Number(node.nodeName.charAt(1));
if (options.headingStyle === 'setext' && hLevel < 3) {
var underline = repeat((hLevel === 1 ? '=' : '-'), content.length);
return (
'\n\n' + content + '\n' + underline + '\n\n'
)
} else {
return '\n\n' + repeat('#', hLevel) + ' ' + content + '\n\n'
}
}
};
rules.blockquote = {
filter: 'blockquote',
replacement: function (content) {
content = content.replace(/^\n+|\n+$/g, '');
content = content.replace(/^/gm, '> ');
return '\n\n' + content + '\n\n'
}
};
rules.list = {
filter: ['ul', 'ol'],
replacement: function (content, node) {
var parent = node.parentNode;
if (parent.nodeName === 'LI' && parent.lastElementChild === node) {
return '\n' + content
} else {
return '\n\n' + content + '\n\n'
}
}
};
rules.listItem = {
filter: 'li',
replacement: function (content, node, options) {
content = content
.replace(/^\n+/, '') // remove leading newlines
.replace(/\n+$/, '\n') // replace trailing newlines with just a single one
.replace(/\n/gm, '\n '); // indent
var prefix = options.bulletListMarker + ' ';
var parent = node.parentNode;
if (parent.nodeName === 'OL') {
var start = parent.getAttribute('start');
var index = Array.prototype.indexOf.call(parent.children, node);
prefix = (start ? Number(start) + index : index + 1) + '. ';
}
return (
prefix + content + (node.nextSibling && !/\n$/.test(content) ? '\n' : '')
)
}
};
rules.indentedCodeBlock = {
filter: function (node, options) {
return (
options.codeBlockStyle === 'indented' &&
node.nodeName === 'PRE' &&
node.firstChild &&
node.firstChild.nodeName === 'CODE'
)
},
replacement: function (content, node, options) {
return (
'\n\n ' +
node.firstChild.textContent.replace(/\n/g, '\n ') +
'\n\n'
)
}
};
rules.fencedCodeBlock = {
filter: function (node, options) {
return (
options.codeBlockStyle === 'fenced' &&
node.nodeName === 'PRE' &&
node.firstChild &&
node.firstChild.nodeName === 'CODE'
)
},
replacement: function (content, node, options) {
var className = node.firstChild.getAttribute('class') || '';
var language = (className.match(/language-(\S+)/) || [null, ''])[1];
var code = node.firstChild.textContent;
var fenceChar = options.fence.charAt(0);
var fenceSize = 3;
var fenceInCodeRegex = new RegExp('^' + fenceChar + '{3,}', 'gm');
var match;
while ((match = fenceInCodeRegex.exec(code))) {
if (match[0].length >= fenceSize) {
fenceSize = match[0].length + 1;
}
}
var fence = repeat(fenceChar, fenceSize);
return (
'\n\n' + fence + language + '\n' +
code.replace(/\n$/, '') +
'\n' + fence + '\n\n'
)
}
};
rules.horizontalRule = {
filter: 'hr',
replacement: function (content, node, options) {
return '\n\n' + options.hr + '\n\n'
}
};
rules.inlineLink = {
filter: function (node, options) {
return (
options.linkStyle === 'inlined' &&
node.nodeName === 'A' &&
node.getAttribute('href')
)
},
replacement: function (content, node) {
var href = node.getAttribute('href');
var title = cleanAttribute(node.getAttribute('title'));
if (title) title = ' "' + title + '"';
return '[' + content + '](' + href + title + ')'
}
};
rules.referenceLink = {
filter: function (node, options) {
return (
options.linkStyle === 'referenced' &&
node.nodeName === 'A' &&
node.getAttribute('href')
)
},
replacement: function (content, node, options) {
var href = node.getAttribute('href');
var title = cleanAttribute(node.getAttribute('title'));
if (title) title = ' "' + title + '"';
var replacement;
var reference;
switch (options.linkReferenceStyle) {
case 'collapsed':
replacement = '[' + content + '][]';
reference = '[' + content + ']: ' + href + title;
break
case 'shortcut':
replacement = '[' + content + ']';
reference = '[' + content + ']: ' + href + title;
break
default:
var id = this.references.length + 1;
replacement = '[' + content + '][' + id + ']';
reference = '[' + id + ']: ' + href + title;
}
this.references.push(reference);
return replacement
},
references: [],
append: function (options) {
var references = '';
if (this.references.length) {
references = '\n\n' + this.references.join('\n') + '\n\n';
this.references = []; // Reset references
}
return references
}
};
rules.emphasis = {
filter: ['em', 'i'],
replacement: function (content, node, options) {
if (!content.trim()) return ''
return options.emDelimiter + content + options.emDelimiter
}
};
rules.strong = {
filter: ['strong', 'b'],
replacement: function (content, node, options) {
if (!content.trim()) return ''
return options.strongDelimiter + content + options.strongDelimiter
}
};
rules.code = {
filter: function (node) {
var hasSiblings = node.previousSibling || node.nextSibling;
var isCodeBlock = node.parentNode.nodeName === 'PRE' && !hasSiblings;
return node.nodeName === 'CODE' && !isCodeBlock
},
replacement: function (content) {
if (!content.trim()) return ''
var delimiter = '`';
var leadingSpace = '';
var trailingSpace = '';
var matches = content.match(/`+/gm);
if (matches) {
if (/^`/.test(content)) leadingSpace = ' ';
if (/`$/.test(content)) trailingSpace = ' ';
while (matches.indexOf(delimiter) !== -1) delimiter = delimiter + '`';
}
return delimiter + leadingSpace + content + trailingSpace + delimiter
}
};
rules.image = {
filter: 'img',
replacement: function (content, node) {
var alt = cleanAttribute(node.getAttribute('alt'));
var src = node.getAttribute('src') || '';
var title = cleanAttribute(node.getAttribute('title'));
var titlePart = title ? ' "' + title + '"' : '';
return src ? '![' + alt + ']' + '(' + src + titlePart + ')' : ''
}
};
function cleanAttribute (attribute) {
return attribute ? attribute.replace(/(\n+\s*)+/g, '\n') : ''
}
/**
* Manages a collection of rules used to convert HTML to Markdown
*/
function Rules (options) {
this.options = options;
this._keep = [];
this._remove = [];
this.blankRule = {
replacement: options.blankReplacement
};
this.keepReplacement = options.keepReplacement;
this.defaultRule = {
replacement: options.defaultReplacement
};
this.array = [];
for (var key in options.rules) this.array.push(options.rules[key]);
}
Rules.prototype = {
add: function (key, rule) {
this.array.unshift(rule);
},
keep: function (filter) {
this._keep.unshift({
filter: filter,
replacement: this.keepReplacement
});
},
remove: function (filter) {
this._remove.unshift({
filter: filter,
replacement: function () {
return ''
}
});
},
forNode: function (node) {
if (node.isBlank) return this.blankRule
var rule;
if ((rule = findRule(this.array, node, this.options))) return rule
if ((rule = findRule(this._keep, node, this.options))) return rule
if ((rule = findRule(this._remove, node, this.options))) return rule
return this.defaultRule
},
forEach: function (fn) {
for (var i = 0; i < this.array.length; i++) fn(this.array[i], i);
}
};
function findRule (rules, node, options) {
for (var i = 0; i < rules.length; i++) {
var rule = rules[i];
if (filterValue(rule, node, options)) return rule
}
return void 0
}
function filterValue (rule, node, options) {
var filter = rule.filter;
if (typeof filter === 'string') {
if (filter === node.nodeName.toLowerCase()) return true
} else if (Array.isArray(filter)) {
if (filter.indexOf(node.nodeName.toLowerCase()) > -1) return true
} else if (typeof filter === 'function') {
if (filter.call(rule, node, options)) return true
} else {
throw new TypeError('`filter` needs to be a string, array, or function')
}
}
/**
* collapseWhitespace(options) removes extraneous whitespace from an the given element.
*
* @param {Object} options
*/
function collapseWhitespace (options) {
var element = options.element;
var isBlock = options.isBlock;
var isVoid = options.isVoid;
var isPre = options.isPre || function (node) {
return node.nodeName === 'PRE'
};
if (!element.firstChild || isPre(element)) return
var prevText = null;
var prevVoid = false;
var prev = null;
var node = next(prev, element, isPre);
while (node !== element) {
if (node.nodeType === 3 || node.nodeType === 4) { // Node.TEXT_NODE or Node.CDATA_SECTION_NODE
var text = node.data.replace(/[ \r\n\t]+/g, ' ');
if ((!prevText || / $/.test(prevText.data)) &&
!prevVoid && text[0] === ' ') {
text = text.substr(1);
}
// `text` might be empty at this point.
if (!text) {
node = remove(node);
continue
}
node.data = text;
prevText = node;
} else if (node.nodeType === 1) { // Node.ELEMENT_NODE
if (isBlock(node) || node.nodeName === 'BR') {
if (prevText) {
prevText.data = prevText.data.replace(/ $/, '');
}
prevText = null;
prevVoid = false;
} else if (isVoid(node)) {
// Avoid trimming space around non-block, non-BR void elements.
prevText = null;
prevVoid = true;
}
} else {
node = remove(node);
continue
}
var nextNode = next(prev, node, isPre);
prev = node;
node = nextNode;
}
if (prevText) {
prevText.data = prevText.data.replace(/ $/, '');
if (!prevText.data) {
remove(prevText);
}
}
}
/**
* remove(node) removes the given node from the DOM and returns the
* next node in the sequence.
*
* @param {Node} node
* @return {Node} node
*/
function remove (node) {
var next = node.nextSibling || node.parentNode;
node.parentNode.removeChild(node);
return next
}
/**
* next(prev, current, isPre) returns the next node in the sequence, given the
* current and previous nodes.
*
* @param {Node} prev
* @param {Node} current
* @param {Function} isPre
* @return {Node}
*/
function next (prev, current, isPre) {
if ((prev && prev.parentNode === current) || isPre(current)) {
return current.nextSibling || current.parentNode
}
return current.firstChild || current.nextSibling || current.parentNode
}
/*
* Set up window for Node.js
*/
var root = (typeof window !== 'undefined' ? window : {});
/*
* Parsing HTML strings
*/
function canParseHTMLNatively () {
var Parser = root.DOMParser;
var canParse = false;
// Adapted from https://gist.github.com/1129031
// Firefox/Opera/IE throw errors on unsupported types
try {
// WebKit returns null on unsupported types
if (new Parser().parseFromString('', 'text/html')) {
canParse = true;
}
} catch (e) {}
return canParse
}
function createHTMLParser () {
var Parser = function () {};
{
if (shouldUseActiveX()) {
Parser.prototype.parseFromString = function (string) {
var doc = new window.ActiveXObject('htmlfile');
doc.designMode = 'on'; // disable on-page scripts
doc.open();
doc.write(string);
doc.close();
return doc
};
} else {
Parser.prototype.parseFromString = function (string) {
var doc = document.implementation.createHTMLDocument('');
doc.open();
doc.write(string);
doc.close();
return doc
};
}
}
return Parser
}
function shouldUseActiveX () {
var useActiveX = false;
try {
document.implementation.createHTMLDocument('').open();
} catch (e) {
if (window.ActiveXObject) useActiveX = true;
}
return useActiveX
}
var HTMLParser = canParseHTMLNatively() ? root.DOMParser : createHTMLParser();
function RootNode (input) {
var root;
if (typeof input === 'string') {
var doc = htmlParser().parseFromString(
// DOM parsers arrange elements in the <head> and <body>.
// Wrapping in a custom element ensures elements are reliably arranged in
// a single element.
'<x-turndown id="turndown-root">' + input + '</x-turndown>',
'text/html'
);
root = doc.getElementById('turndown-root');
} else {
root = input.cloneNode(true);
}
collapseWhitespace({
element: root,
isBlock: isBlock,
isVoid: isVoid
});
return root
}
var _htmlParser;
function htmlParser () {
_htmlParser = _htmlParser || new HTMLParser();
return _htmlParser
}
function Node (node) {
node.isBlock = isBlock(node);
node.isCode = node.nodeName.toLowerCase() === 'code' || node.parentNode.isCode;
node.isBlank = isBlank(node);
node.flankingWhitespace = flankingWhitespace(node);
return node
}
function isBlank (node) {
return (
!isVoid(node) &&
!isMeaningfulWhenBlank(node) &&
/^\s*$/i.test(node.textContent) &&
!hasVoid(node) &&
!hasMeaningfulWhenBlank(node)
)
}
function flankingWhitespace (node) {
var leading = '';
var trailing = '';
if (!node.isBlock) {
var hasLeading = /^\s/.test(node.textContent);
var hasTrailing = /\s$/.test(node.textContent);
var blankWithSpaces = node.isBlank && hasLeading && hasTrailing;
if (hasLeading && !isFlankedByWhitespace('left', node)) {
leading = ' ';
}
if (!blankWithSpaces && hasTrailing && !isFlankedByWhitespace('right', node)) {
trailing = ' ';
}
}
return { leading: leading, trailing: trailing }
}
function isFlankedByWhitespace (side, node) {
var sibling;
var regExp;
var isFlanked;
if (side === 'left') {
sibling = node.previousSibling;
regExp = / $/;
} else {
sibling = node.nextSibling;
regExp = /^ /;
}
if (sibling) {
if (sibling.nodeType === 3) {
isFlanked = regExp.test(sibling.nodeValue);
} else if (sibling.nodeType === 1 && !isBlock(sibling)) {
isFlanked = regExp.test(sibling.textContent);
}
}
return isFlanked
}
var reduce = Array.prototype.reduce;
var leadingNewLinesRegExp = /^\n*/;
var trailingNewLinesRegExp = /\n*$/;
var escapes = [
[/\\/g, '\\\\'],
[/\*/g, '\\*'],
[/^-/g, '\\-'],
[/^\+ /g, '\\+ '],
[/^(=+)/g, '\\$1'],
[/^(#{1,6}) /g, '\\$1 '],
[/`/g, '\\`'],
[/^~~~/g, '\\~~~'],
[/\[/g, '\\['],
[/\]/g, '\\]'],
[/^>/g, '\\>'],
[/_/g, '\\_'],
[/^(\d+)\. /g, '$1\\. ']
];
function TurndownService (options) {
if (!(this instanceof TurndownService)) return new TurndownService(options)
var defaults = {
rules: rules,
headingStyle: 'setext',
hr: '* * *',
bulletListMarker: '*',
codeBlockStyle: 'indented',
fence: '```',
emDelimiter: '_',
strongDelimiter: '**',
linkStyle: 'inlined',
linkReferenceStyle: 'full',
br: ' ',
blankReplacement: function (content, node) {
return node.isBlock ? '\n\n' : ''
},
keepReplacement: function (content, node) {
return node.isBlock ? '\n\n' + node.outerHTML + '\n\n' : node.outerHTML
},
defaultReplacement: function (content, node) {
return node.isBlock ? '\n\n' + content + '\n\n' : content
}
};
this.options = extend({}, defaults, options);
this.rules = new Rules(this.options);
}
TurndownService.prototype = {
/**
* The entry point for converting a string or DOM node to Markdown
* @public
* @param {String|HTMLElement} input The string or DOM node to convert
* @returns A Markdown representation of the input
* @type String
*/
turndown: function (input) {
if (!canConvert(input)) {
throw new TypeError(
input + ' is not a string, or an element/document/fragment node.'
)
}
if (input === '') return ''
var output = process.call(this, new RootNode(input));
return postProcess.call(this, output)
},
/**
* Add one or more plugins
* @public
* @param {Function|Array} plugin The plugin or array of plugins to add
* @returns The Turndown instance for chaining
* @type Object
*/
use: function (plugin) {
if (Array.isArray(plugin)) {
for (var i = 0; i < plugin.length; i++) this.use(plugin[i]);
} else if (typeof plugin === 'function') {
plugin(this);
} else {
throw new TypeError('plugin must be a Function or an Array of Functions')
}
return this
},
/**
* Adds a rule
* @public
* @param {String} key The unique key of the rule
* @param {Object} rule The rule
* @returns The Turndown instance for chaining
* @type Object
*/
addRule: function (key, rule) {
this.rules.add(key, rule);
return this
},
/**
* Keep a node (as HTML) that matches the filter
* @public
* @param {String|Array|Function} filter The unique key of the rule
* @returns The Turndown instance for chaining
* @type Object
*/
keep: function (filter) {
this.rules.keep(filter);
return this
},
/**
* Remove a node that matches the filter
* @public
* @param {String|Array|Function} filter The unique key of the rule
* @returns The Turndown instance for chaining
* @type Object
*/
remove: function (filter) {
this.rules.remove(filter);
return this
},
/**
* Escapes Markdown syntax
* @public
* @param {String} string The string to escape
* @returns A string with Markdown syntax escaped
* @type String
*/
escape: function (string) {
return escapes.reduce(function (accumulator, escape) {
return accumulator.replace(escape[0], escape[1])
}, string)
}
};
/**
* Reduces a DOM node down to its Markdown string equivalent
* @private
* @param {HTMLElement} parentNode The node to convert
* @returns A Markdown representation of the node
* @type String
*/
function process (parentNode) {
var self = this;
return reduce.call(parentNode.childNodes, function (output, node) {
node = new Node(node);
var replacement = '';
if (node.nodeType === 3) {
replacement = node.isCode ? node.nodeValue : self.escape(node.nodeValue);
} else if (node.nodeType === 1) {
replacement = replacementForNode.call(self, node);
}
return join(output, replacement)
}, '')
}
/**
* Appends strings as each rule requires and trims the output
* @private
* @param {String} output The conversion output
* @returns A trimmed version of the ouput
* @type String
*/
function postProcess (output) {
var self = this;
this.rules.forEach(function (rule) {
if (typeof rule.append === 'function') {
output = join(output, rule.append(self.options));
}
});
return output.replace(/^[\t\r\n]+/, '').replace(/[\t\r\n\s]+$/, '')
}
/**
* Converts an element node to its Markdown equivalent
* @private
* @param {HTMLElement} node The node to convert
* @returns A Markdown representation of the node
* @type String
*/
function replacementForNode (node) {
var rule = this.rules.forNode(node);
var content = process.call(this, node);
var whitespace = node.flankingWhitespace;
if (whitespace.leading || whitespace.trailing) content = content.trim();
return (
whitespace.leading +
rule.replacement(content, node, this.options) +
whitespace.trailing
)
}
/**
* Determines the new lines between the current output and the replacement
* @private
* @param {String} output The current conversion output
* @param {String} replacement The string to append to the output
* @returns The whitespace to separate the current output and the replacement
* @type String
*/
function separatingNewlines (output, replacement) {
var newlines = [
output.match(trailingNewLinesRegExp)[0],
replacement.match(leadingNewLinesRegExp)[0]
].sort();
var maxNewlines = newlines[newlines.length - 1];
return maxNewlines.length < 2 ? maxNewlines : '\n\n'
}
function join (string1, string2) {
var separator = separatingNewlines(string1, string2);
// Remove trailing/leading newlines and replace with separator
string1 = string1.replace(trailingNewLinesRegExp, '');
string2 = string2.replace(leadingNewLinesRegExp, '');
return string1 + separator + string2
}
/**
* Determines whether an input can be converted
* @private
* @param {String|HTMLElement} input Describe this parameter
* @returns Describe what it returns
* @type String|Object|Array|Boolean|Number
*/
function canConvert (input) {
return (
input != null && (
typeof input === 'string' ||
(input.nodeType && (
input.nodeType === 1 || input.nodeType === 9 || input.nodeType === 11
))
)
)
}
return TurndownService;
}());
var options = {"headingStyle":"atx","hr":"***","bulletListMarker":"-","codeBlockStyle":"fenced","fence":"```","emDelimiter":"*","strongDelimiter":"**","linkStyle":"inlined","linkReferenceStyle":"full","preformattedCode":true};
var turndownService = new TurndownService(options);
/* 注意事项
1. 规则扩展中的变量只能用 var 声明。
2. 写法参见 https://github.com/mixmark-io/turndown#options
*/
// 支持高亮
var highlightRegExp = /highlight-(?:text|source)-([a-z0-9]+)/;
turndownService.addRule('highlightedCodeBlock', {
filter: function(node) {
var firstChild = node.firstChild;
return (
node.nodeName === 'DIV' &&
highlightRegExp.test(node.className) &&
firstChild &&
firstChild.nodeName === 'PRE'
)
},
replacement: function(content, node, options) {
var className = node.className || '';
var language = (className.match(highlightRegExp) || [null, ''])[1];
return (
'\n\n' + options.fence + language + '\n' +
node.firstChild.textContent +
'\n' + options.fence + '\n\n'
)
}
});
// 支持删除线
turndownService.addRule('strikethrough', {
filter: ['del', 's', 'strike'],
replacement: function(content) {
return '~' + content + '~'
}
});
// 支持待办事项
turndownService.addRule('taskListItems', {
filter: function (node) {
return node.type === 'checkbox' && node.parentNode.nodeName === 'LI'
},
replacement: function (content, node) {
return (node.checked ? '[x]' : '[ ]') + ' '
}
});
//turndownService.addRule('smeditpro', {
// filter: function (node) {
// return node.nodeName === 'SPAN' && node.getAttribute("class") === 'extractt'
// },
// replacement: function (node) {
// return "12<b>hah</b>"
// }
// });
// 保留和呈现 HTML 的元素
turndownService.keep(['table', 'th', 'tr', 'td', 'thead', 'tbody', 'tfoot', 'caption', 'colgroup', 'col','span.extractt']);
// 要移除的元素
turndownService.remove(['title', 'textarea', 'style', 'xmp', 'iframe', 'noembed', 'noframes', 'script', 'plaintext']);
var tables = turndownPluginGfm.tables;
turndownService.use([tables])
var mdContent = turndownService.turndown("<table>\r\n<thead>\r\n<tr>\r\n<th>标题</th>\r\n<th>内容</th>\r\n</tr>\r\n</thead>\r\n<tbody>\r\n<tr>\r\n<td>内容</td>\r\n<td><span>高亮</span></td>\r\n</tr>\r\n</tbody>\r\n</table>\r\n");
mdContent;
```
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