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。
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If you ever need to check if a string begins with another string in JavaScript, use ES6's startsWith method...
This method has been added to the ECMAScript 6 specification and may not be available in all JavaScript implementations yet. However, you can polyfill String.prototype.startsWith() with the following snippet: if (!String.prototype.startsWith) { String.prototype.startsWith = function(searchString,...