用javascript写一个计算10的n次方的程序怎么写

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用javascript写一个计算10的n次方的程序怎么写,第1张

<script language="javascript">

function myPow(a,n){

var ret = 1

var i

for (i = 0i<ni++){

ret = ret * a

}

return ret

}

</script>

<input type="button" value="click me" onclick="alert(myPow(10,3))">

<!DOCTYPE html>

<html>

<head>

<title></title>

</head>

<body>

<div>

<span>初始值：</span><input type='number' id='number' value='1' placeholder='请输入初始值'/>

</div>

<div>

<span>乘次数：</span><input type='number' id='input'/><button onclick='getValue()'>求值</button>

</div>

<div>值等于：<span id="value"></span></div>

</body>

<script type="text/javascript">

function dom(id)

{

return document.getElementById(id)

}

function getValue()

{

var v = parseInt(dom('input').value)

var n = dom('number').value - 0

if(!n||isNaN(n)){

dom('value').innerHTML = '请输入初始值数字'

return

}

if(!v||isNaN(v)){

dom('value').innerHTML = '请输入乘次数数字'

return

}

dom('value').innerHTML = parseFloat(n*Math.pow(0.1,v)).toFixed(v)

}

</script>

</html>