时间:2021-07-01 10:21:17 帮助过:62人阅读
本文实例讲述了JavaScript实现Java中StringBuffer的方法。分享给大家供大家参考。具体如下:
Javascript StringBuffer类的实现是通过prototype构造一个StringBuffer类,代码如下:
function StringBuffer() { this.__strings__ = new Array(); } StringBuffer.prototype.append = function(str) { this.__strings__.push(str); }; StringBuffer.prototype.toString = function() { return this.__strings__.join(""); };
例子:
<html> <head> <title>test</title> <script type="text/javascript"> function StringBuffer() { this.__strings__ = new Array(); } StringBuffer.prototype.append = function(str) { this.__strings__.push(str); }; StringBuffer.prototype.toString = function() { return this.__strings__.join(""); }; function testStringBuffer(){ var date1 = new Date(); var str; for( var i=0; i<10000; i++){ str += "text"; } var date2 = new Date(); document.writeln("Sting use time:"+ (date2 - date1) +"ms"); //StringBuffer var date3 = new Date(); var strBuffer = new StringBuffer(); for(i=0; i<10000; i++){ strBuffer.append("text"); } strBuffer.toString(); var date4 = new Date(); document.writeln("<br/>StringBuffer use time:"+ (date4 - date3) +"ms"); } </script> </head> <body> <input type="button" value="testStringBuffer" onclick="testStringBuffer()"/> </body> </html>
希望本文所述对大家的javascript程序设计有所帮助。