JavaScript中String和StringBuffer的速度之争_javascript技巧

function StringBuffer(){
this.content = new Array;
}
StringBuffer.prototype.append = function( str ){
this.content.push( str );
}
StringBuffer.prototype.toString = function(){
return this.content.join("");
}

<script> <BR>function testStringBuffer(){ <BR>var date1 = new Date(); <BR>var str; <BR>for( var i=0; i<10000; i++){ <BR>str += "text"; <BR>} <BR>var date2 = new Date(); <BR>document.writeln("Sting use time:"+ (date2 - date1) +"ms"); <BR>var date3 = new Date(); <BR>var strBuffer = new StringBuffer(); <BR>for(i=0; i<10000; i++){ <BR>strBuffer.append("text"); <BR>} <BR>strBuffer.toString(); <BR>var date4 = new Date(); <BR>document.writeln("<br/>StringBuffer use time:"+ (date4 - date3) +"ms"); <BR>} <BR></script>