复制代码 代码如下: /**************************************************** *CreateBy:joe zhou *CreateDate:2011-9-4 *Description:字符串辅助函数 ****************************************************/ //String.prototype = { // caption: function () { // }, // leftPad: function (padChar, width) { // if (this.length >= width) { // return this; // } // } //}; String.prototype.padLeft = function (padChar, width) { var ret = this; while (ret.length < width) { if (ret.length + padChar.length < width) { ret = padChar + ret; } else { ret = padChar.substring(0, width-ret.length) + ret; } } return ret; }; String.prototype.padRight = function (padChar, width) { var ret = this; while (ret.length < width) { if (ret.length + padChar.length < width) { ret += padChar; } else { ret += padChar.substring(0, width - ret.length); } } return ret; }; String.prototype.trim = function () { return this.replace(/^s+/, '').replace(/s+$/, ''); }; String.prototype.trimLeft = function () { return this.replace(/^s+/, ''); }; String.prototype.trimRight = function () { return this.replace(/s+$/, ''); }; String.prototype.caption = function () { if (this) { return this.charAt(0).toUpperCase() + this.substr(1); } return this; }; String.prototype.reverse = function () { var ret = ''; for (var i = this.length - 1; i >= 0; i--) { ret += this.charAt(i); } return ret; }; String.prototype.startWith = function (compareValue, ignoreCase) { if (ignoreCase) { return this.toLowerCase().indexOf(compareValue.toLowerCase()) == 0; } return this.indexOf(compareValue) == 0 }; String.prototype.endWith = function (compareValue, ignoreCase) { if (ignoreCase) { return this.toLowerCase().lastIndexOf(compareValue.toLowerCase()) == this.length - compareValue.length; } return this.lastIndexOf(compareValue) == this.length - compareValue.length; };
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本文标题:JS字符串函数扩展代码
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