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join函数
| 代码如下 |
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var arr = [1, 2, 3, 4, 5, 6];
var value = eval(arr.join("+"));
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当然我们还可以使用遍历的方法
例
| 代码如下 |
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<title>求出数组中所有数字的和</title>
<style>
body{color:#999;font:12px/1.5 Tahoma;}
#outer{width:500px;margin:0 auto;}
#outer input{padding:3px;border:1px solid #ccc;font-family:inherit;width:220px;margin-right:10px;}
.sum{font-size:30px;color:red;}
</style>
<script>
window.onload = function ()
{
var oBtn = document.getElementsByTagName("button")[0];
var oInput = document.getElementsByTagName("input")[0]
var oStrong = document.getElementsByTagName("strong")[0];
oInput.onkeyup = function ()
{
this.value = this.value.replace(/[^(d)|(,)]/,"")
}
oBtn.onclick = function ()
{
var sum = 0;
var oInput = document.getElementsByTagName("input")[0].value.split(",");
for (var i in oInput)
{
sum += parseInt(oInput[i])
}
oStrong.innerHTML = sum
}
}
</script>
</head>
<body>
<div id="outer">
<label><input type="text" value="1,2,3,4,5,6,7,8,9,10,11,12,13,14,15" /><span>输入数字求和，数字之间用半角","号分隔</span></label>
<p><button>求和</button></p>
<strong class="sum"></strong>
</div>
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