为输入框加入数字js校验代码分享

<input value="" type="text" onkeyup="javascript:RepNumber(this)">

function RepNumber(obj) {
 var reg = /^[\d]+$/g;
 if (!reg.test(obj.value)) {
 var txt = obj.value;
 txt.replace(/[^0-9]+/,
 function(char, index, val) { //匹配第一次非数字字符
 obj.value = val.replace(/\D/g, ""); //将非数字字符替换成""
 var rtextRange = null;
 if (obj.setSelectionRange) {
 obj.setSelectionRange(index, index);
 } else { //支持ie
 rtextRange = obj.createTextRange();
 rtextRange.moveStart('character', index);
 rtextRange.collapse(true);
 rtextRange.select();
 }
 })
 }
}

function chkNumber(eleText)
 {
 var value =eleText.value;
 var len =value.length;
 for(vari=0;i<len;i++)
 {
 if(value.charAt(i)>"9"|| value.charAt(i)<"0")
 {
 alert("含有非数字字符");
 eleText.focus();
 break;
 }
 }
 }