状态栏慢慢计算Pi值

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-- 网页特效 (http://www.webasp.net/javascript/)
--- 状态栏慢慢计算Pi值 (http://www.webasp.net/javascript/1/513.htm)
-- 发布日期： 2005-06-15
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<!-- 第 1 步： -->
<!-- 把下面的代码加到<BODY></BODY>区域中： -->

<script>
<!--

function pi(name){
this.init = init;
this.compNext = p_compNext;
this.printPi = p_printPi;
this.computePi = p_computePi;
this.runs = new Number();
this.data = new Number();
this.sign = new Number();
this.name = name;
//this.init();
}

function init(){
this.runs = -1;
this.data = 0;
this.sign = -1;
}

function p_computePi(delay){
//eval(this.name+".compNext();");
this.compNext();
if (this.runs %100 == 0) this.printPi();
//eval(this.name+".printPi();");
setTimeout(this.name + ".computePi("+delay+")",delay);
}

function p_printPi(){
//document.pi.pivalue.value = this.data * 4;
window.status = "[" + this.runs + "] > " + this.data * 4;
//document.pi.runs.value = this.runs;
}

function p_compNext(){
this.sign = parseInt(this.sign) * -1;
this.runs = parseInt(this.runs) + 1;
this.data += Math.pow((parseInt(this.runs) * 2 + 1),-1) * this.sign;
}

myPi = new pi("myPi");
myPi.init();
myPi.computePi(1);
//-->
</script>

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