The example in this article describes how JS uses parseInt to parse numbers to implement summation. Share it with everyone for your reference. The details are as follows:
Use the parseInt in the JavaScript function on the web page to parse the numbers and sum them up. If you are talented, please study it when you have time.
The operation effect is as shown below:
The specific code is as follows:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>用parseInt解析数字，并求和</title>
<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;}
</style>
<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 < 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);
}
};
</script>
</head>
<body>
<input type="text" class="f-text" /><strong>+</strong><input type="text" class="f-text" /><strong>=</strong><span>?</span><input type="button" value="求和" />
</body>
</html>I hope this article will be helpful to everyone’s JavaScript programming design.
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