/*js字符串相加类似C# StringBuild.Appand() ----性能较好*/ function StringBuffer() { this._strings_=new Array; } StringBuffer.prototype.append=function (str) { this._strings_.push(str); }; StringBuffer.prototype.toString=function() { return this._strings_.join(""); }; /*js字符串相加类似C# StringBuild.Appand() 结束*/