JS uses parseInt to parse numbers to implement summation examples in detail-JS Tutorial-php.cn

JS uses parseInt to parse numbers to implement summation examples in detail

巴扎黑

Release： 2017-09-14 11:54:05

Original

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本文实例讲述了JS使用parseInt解析数字实现求和的方法。分享给大家供大家参考。具体如下：

在网页上使用JavaScript函数中的parseInt解析数字，并求和，有才吧，有空了研究一下。

运行效果如下图所示：

具体代码如下：

&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
&lt;html xmlns="http://www.w3.org/1999/xhtml">
&lt;head>
&lt;meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
&lt;title>用parseInt解析数字，并求和&lt;/title>
&lt;style> 
body{font:12px/1.5 arial;text-align:center;}
.f-text{width:50px;border:1px solid #ccc;background:#f0f0f0;font-family:inherit;padding:3px;}
span{color:green;padding-right:10px;font-weight:700;}
strong{padding:0 10px;}
&lt;/style>
&lt;script type="text/javascript"> 
window.onload = function ()
{
 var aInput = document.getElementsByTagName("input");
 var aSpan = document.getElementsByTagName("span")[0];
 var i = 0;
 for (i = 0; i &lt; aInput.length - 1; i++)
 {
  aInput[i].onkeyup = function ()
  {
   this.value = this.value.replace(/[^d]/,"")
  } 
 }
 aInput[2].onclick = function ()
 {
  (aInput[0].value == "" || aInput[1].value == "") ?
  alert("请输入数字！") :
  aSpan.innerHTML = parseInt(aInput[0].value) + parseInt(aInput[1].value);
 }
};
&lt;/script>
&lt;/head>
&lt;body>
&lt;input type="text" class="f-text" />&lt;strong>+&lt;/strong>&lt;input type="text" class="f-text" />&lt;strong>=&lt;/strong>&lt;span>?&lt;/span>&lt;input type="button" value="求和" />
&lt;/body>
&lt;/html>

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