JS control text box to enter only the number and decimal point method

This article mainly introduces the JS control text box only input numbers and decimal point of the method, example analysis of JavaScript using regular expression to achieve the limit of numbers and decimal point of the skills, has a certain reference value, the need for friends can refer to the

This article describes the JS control text box to enter only the number and decimal point method. Share to everyone for your reference. The implementation methods are as follows:

The code is as follows: function Clearnonum (obj) {
Obj.value = Obj.value.replace (/[^d.) /g, "")//Clear "number" and "." Characters outside of
Obj.value = Obj.value.replace (/^./g, "");//Verify that the first character is a number instead of a.
Obj.value = Obj.value.replace (/.{ 2,}/g, "."); /Keep only the first one. Clear the excess.
Obj.value = Obj.value.replace (".", "$#$"). Replace (/./g, ""). Replace ("$#$", ".");
}

Usage is as follows:

The code is as follows: <input name= "input1" onkeyup= "Clearnonum (This)" >

I hope this article will help you with your JavaScript programming.