Hàm kiểm tra coi có phải là số không??

<input type=”text” name=”number” onkeypress=”return isNumberKey(event);” placeholder=”Nhập số” id=”number” /><br />

function isNumberKey(evt){
var charCode = (evt.which) ? evt.which : event.keyCode
return !(charCode > 31 && (charCode < 48 || charCode > 57));
}

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