String 的 startsWith() 方法用来判断当前字符串是否以另外一个给定的子字符串开头,并根据判断结果返回 true 或 false。
startsWith()方法用来判断当前字符串是否是以另外一个给定的子字符串“开头”的,根据判断结果返回true或false。 语法 str.startsWith(searchString[,position]); 参数 searchString 要搜索的子字符串。 position 在str中搜索searchString的开始位置,默认值为 0,也就是真正的字符串开头处。
直接来自 MDN 页面,这里是 polyfill: if (!String.prototype.startsWith) { Object.defineProperty(String.prototype, 'startsWith', { value: function(search, rawPos) { var pos = rawPos > 0 ? rawPos|0 : 0; return this.substring(pos, pos + search.length) === search; } }); } 这在任何...
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Lastly, we convert the extracted value to a number using theNumber()constructor. If you ever need help reading a regular expression, check out thisregular expression cheat sheetby MDN. It contains a table with the name and the meaning of each special character with examples. ...
import'mdn-polyfills/POLYFILL_NAME';// For example:// (ES6 Modules)import'mdn-polyfills/Array.prototype.includes';import'mdn-polyfills/Object.create';// (CommonJS)require('mdn-polyfills/CustomEvent');require('mdn-polyfills/String.prototype.padStart');// and so on ... ...
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The startsWith() method determines whether a string begins with the characters of another string, returning true or false as appropriate.