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fix to 'startsWith' javascript error when using IE
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| /*! https://mths.be/startswith v0.2.0 by @mathias */ | ||
| if (!String.prototype.startsWith) { | ||
| (function() { | ||
| 'use strict'; // needed to support `apply`/`call` with `undefined`/`null` | ||
| var defineProperty = (function() { | ||
| // IE 8 only supports `Object.defineProperty` on DOM elements | ||
| try { | ||
| var object = {}; | ||
| var $defineProperty = Object.defineProperty; | ||
| var result = $defineProperty(object, object, object) && $defineProperty; | ||
| } catch(error) {} | ||
| return result; | ||
| }()); | ||
| var toString = {}.toString; | ||
| var startsWith = function(search) { | ||
| if (this == null) { | ||
| throw TypeError(); | ||
| } | ||
| var string = String(this); | ||
| if (search && toString.call(search) == '[object RegExp]') { | ||
| throw TypeError(); | ||
| } | ||
| var stringLength = string.length; | ||
| var searchString = String(search); | ||
| var searchLength = searchString.length; | ||
| var position = arguments.length > 1 ? arguments[1] : undefined; | ||
| // `ToInteger` | ||
| var pos = position ? Number(position) : 0; | ||
| if (pos != pos) { // better `isNaN` | ||
| pos = 0; | ||
| } | ||
| var start = Math.min(Math.max(pos, 0), stringLength); | ||
| // Avoid the `indexOf` call if no match is possible | ||
| if (searchLength + start > stringLength) { | ||
| return false; | ||
| } | ||
| var index = -1; | ||
| while (++index < searchLength) { | ||
| if (string.charCodeAt(start + index) != searchString.charCodeAt(index)) { | ||
| return false; | ||
| } | ||
| } | ||
| return true; | ||
| }; | ||
| if (defineProperty) { | ||
| defineProperty(String.prototype, 'startsWith', { | ||
| 'value': startsWith, | ||
| 'configurable': true, | ||
| 'writable': true | ||
| }); | ||
| } else { | ||
| String.prototype.startsWith = startsWith; | ||
| } | ||
| }()); | ||
| } |
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