本文實例講述了JavaScript實現Java中StringBuffer的方法。分享給大家供大家參考。具體如下：
Javascript StringBuffer類的實現是通過prototype構造一個StringBuffer類，代碼如下：
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>希望本文所述對大家的javascript程序設計有所幫助。