STRING对象的增强函数_js

<script>
//测字符串实际长度
String.prototype.Tlength = function(){var arr=this.match(/[^/x00-/xff]/ig);return this.length+(arr==null?0:arr.length);}

//字符串左取
String.prototype.left = function(num,mode){if(!//d+/.test(num))return(this);var str = this.substr(0,num);if(!mode) return str;var n = str.Tlength() – str.length;num = num – parseInt(n/2);return this.substr(0,num);}

//字符串右取
String.prototype.right = function(num,mode){if(!//d+/.test(num))return(this);var str = this.substr(this.length-num);if(!mode) return str;var n = str.Tlength() – str.length;num = num – parseInt(n/2);return this.substr(this.length-num);}

//字符串包含
String.prototype.GetCount = function(str,mode){return eval(“this.match(/(“+str+”)/g”+(mode?”i”:””)+”).length”);}

//字符串去除两端空字符
String.prototype.Trim=function(){return this.replace(/(^/s*)|(/s*$)/g,””);}
String.prototype.Ltrim = function(){return this.replace(/(^/s*)/g, “”);}
String.prototype.Rtrim = function(){return this.replace(/(/s*$)/g, “”);}

</script>

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