String 对象增强
<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, "");}
document.write("'aa啦啦aa'.Tlength() = " + "aa啦啦aa".Tlength());
document.write("<br>");
document.write("'aabbcc'.Tlength() = " + "aabbcc".Tlength());
document.write("<br>");
document.write("'aa啦啦aa'.left(4) = " + "aa啦啦aa".left(4));
document.write("<br>");
document.write("'aa啦啦aa'.left(4,true) = " + "aa啦啦aa".left(4,true));
document.write("<br>");
document.write("'aa啦啦aa'.right(4) = " + "aa啦啦aa".right(4));
document.write("<br>");
document.write("'aa啦啦aa'.right(4,true) = " + "aa啦啦aa".right(4,true));
document.write("<br>");
document.write("'abAcae'.GetCount('a') = " + "abAcae".GetCount("a"));
document.write("<br>");
document.write("'abAcae'.GetCount('a',true) = " +
"abAcae".GetCount("a",true));
document.write("<br>");
document.write("' abc de '.Ltrim() = " + " abc de ".Ltrim());
document.write("<br>");
document.write("' abc de '.Rtrim() = " + " abc de ".Rtrim());
document.write("<br>");
document.write("' abc de '.Trim() = " + " abc de ".Trim());
</script>
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