jquery method to determine whether it is a number

The jquery method to determine whether it is a number: first create a front-end code sample file; then use the "if(!isNaN(t)){...}" method to determine whether it is a number; finally output the judgment result: Can.

The operating environment of this tutorial: Windows 7 system, jquery version 1.10.0. This method is suitable for all brands of computers.

Recommended: "jquery Tutorial"

jQuery method to determine whether it is a number and convert number function

<script language="javascript">
var t=$("#id").val();//这个就是我们要判断的值了
if(!isNaN(t)){
  alert("是数字");
}else{
  alert("不全是数字");
}
</script>

Attachment:

JavaScript Number() function

Number() function converts the value of the object into a number.

<script type="text/javascript">
var test1= new Boolean(true);
var test2= new Boolean(false);
var test3= new Date();
var test4= new String("999");
var test5= new String("999 888");
document.write(Number(test1)+ "<br />");
document.write(Number(test2)+ "<br />");
document.write(Number(test3)+ "<br />");
document.write(Number(test4)+ "<br />");
document.write(Number(test5)+ "<br />");
</script>

Output

1
0
1256657776588
999
NaN

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