对象基础

 

<mce:script type='text/javascript'><!--function StringBuffer() {this.__strings = new Array;if (typeof StringBuffer.__initialized == "undefined") {StringBuffer.prototype.append = function(str) {this.__strings.push(str);/*for (var i = 0; i < arguments.length; i++) {this.__strings.push(arguments[i]);}*/}StringBuffer.prototype.toString = function() {return this.__strings.join("");}}}var buffer = new StringBuffer;buffer.append("hello ", "world ");buffer.append("world");var d1 = new Date;var str = "";for (var i = 0; i < 10; i++) {str += ("text" + i);}var d2 = new Date;document.write("1：" + (d2.getTime() - d1.getTime()) +"ms<br/>");//document.write(str + "<br/>");var stringBuffer = new StringBuffer;var d3 = new Date;for (var i = 0; i < 10; i++) {stringBuffer.append("text" + i);}var sResult = stringBuffer.toString();var d4 = new Date;document.write("2：" + (d4.getTime() - d3.getTime()) + "ms<br/>");//document.write(sResult);Array.prototype.toString = function() {return "Array.toString() is overided!";}var arr = new Array;alert(arr);// --></mce:script>