How to make a textbox numeric only using jquery

Firstly declare a input textbox & then applying the following regex on the keyup event of textbox like this:

<input type="text" name="txtSalary" id="txtSalary" />

 $('#txtSalary').keyup(function (e) {

        if (/\D/g.test(this.value)) {

            // Filter non-digits from input value.

            this.value = this.value.replace(/\D/g, '');

        }

    });