Simple example of javascript judging non-number_javascript skills
May 16, 2016 pm 05:28 PM
javascript
Copy code The code is as follows:
<html>
<head>
< ;title> Determine whether it is a number or a space
<script type="text/javascript">
function check_num() //Create function
{
var Num=document.getElementById("num").value; //Get Value (id=num)
if(isNaN(Num) || Num=="" || Num.substring(0,0)==0) //Note that the substring function is used to determine spaces
{
alert("Please do not enter non-digits");
return false; script>
</head>
<body>
Please enter a number: <input type="text" id="num" name="num" value="">
<input type="submit" value="Submit" o~n~c~l~i~c~k~="check_num"> //This is actually onclick but it is not allowed to write
</ body>
</html>
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