The front end restricts the input information to only numbers

When the input information in js is restricted to numbers only

One: js effect

onkeyup="this.value=this.value.replace(/\D/g,'')"onafterpaste="this.value=this.value.replace(/\D/g,'')"  placeholder ="请输入数字类型"

Two: regular effect

Satisfy var zhi=/^\d{3}$/;

if(zhi.test(value))

{

  ok

}