键盘输入检查

来源：互联网发布：三星note8网络不好编辑：程序博客网时间：2024/04/25 20:08

<input type=text onpaste="return false" onkeypress="a()">数字<br> <input type=text onpaste="return false" onkeypress="b()">汉字<br> <input type=text onpaste="return false" onkeypress="c()">非汉字<br> <input type=text onpaste="return false" onkeypress="d()">数字加字符<br> <script language=javascript> function a() { var k = window.event.keyCode; if (k < 48 || k > 57){ alert("你输入的不是数字！") window.event.keyCode = 0 ;} } function b() { var k = window.event.keyCode; if (k < 255){ alert("你输入的不是汉字！"); window.event.keyCode = 0 ;} } function c() { var k = window.event.keyCode; if (k > 255){ alert("你输入了汉字！"); window.event.keyCode = 0 ;} } function d() { var k = window.event.keyCode; if (!(((k >= 48) && (k <=57)) || ((k>=65) && (k<=90)) || ((k>=97) && (k<=122)))){ alert("你输入了非法字符！"); window.event.keyCode = 0 ;} } </script>