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<script language="JScript">
function StringBuilder(sString){//字符串连接操作类
this.length=0;
this.append=function(sString){
this.length+=(this._parts[this._current++]=String(sString)).length;
this._string=null;
return this;
}
this.toString=function(){
if(this._string!=null)
return this._string;
var s=this._parts.join("");
this._parts=[s];
this._current=1;
return this._string=s;
}
this._current=0;
this._parts=[];
this._string=null;
if(sString!=null)
this.append(sString);
}
var str=new StringBuilder();
str.append("a");
str.append("b");
alert(str.toString());
</script>
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