自定义StringBuffer js

 

/**
 * @author kevin
 */

 function StringBuffer(){
     this._strings = new Array;
    if(typeof StringBuffer.initailized == "undefined"){
        StringBuffer.prototype.append = function(str){
            this._strings.push(str);
            return this;
        }
        StringBuffer.prototype.toString = function(){
            return this._strings.join('');
        }
        
        StringBuffer.initailized = true;
    }
 }

 var s = new StringBuffer();
 s.append("my name is ").append("kevin");
 alert(s)  //my name is kevin

 var s2 = new StringBuffer();
 s2.append("my name is ").append("chengkai");
 alert(s2) //my name is chengkai