Only scripts that are smaller than the maximum number and are positive integers can be entered_Form special effects

Maximum number: 98765 <input type="text" value="123456" name="tt" onkeydown="numInputCheck(this,98765)"> Test the specific functions yourself :)
[Ctrl A select all Note: If you need to introduce external Js, you need to refresh to execute

]<script> /* 只允许输入数字 */ function numInputCheck(o,m){ var d; if(',48,49,50,51,52,53,54,55,56,57,96,97,98,99,100,101,102,103,104,105,8,9,13,'.indexOf(',' + event.keyCode + ',')==-1){ event.returnValue=null; } if(m!=null){ d = event.keyCode >= 96 ? event.keyCode - 48 : event.keyCode; if(document.selection.createRange().duplicate().text=='' && (o.value+String.fromCharCode(d))>m){ event.returnValue=null;o.value=m; }else if(',8,9,13,'.indexOf(',' + d + ',')==-1&&document.selection.createRange().duplicate().text==''&&o.value.indexOf('0')==0){ o.value=''; } } } </script>