//input標簽只能正數(shù)字<input onkeyup="this.value=this.value.replace(/[^1-9]/g,'')" >//只能輸入正整數(shù)function CheckNum(thisobj) {if (thisobj.value == "0") {} else {           var firstNum = thisobj.value.toString().substring(0, 1);if (thisobj.value.length==1) {thisobj.value = thisobj.value.replace(/[^0-9]/g, '');}else if (thisobj.value.length > 1 && firstNum == "0") {thisobj.value = "0";} else if (thisobj.value.length > 1) {thisobj.value = thisobj.value.replace(/[^0-9]/g, '')}}}//只能輸入金額function ClearNoNum(obj) {if (obj.value == "0") {} else {var firstNum = obj.value.toString().substring(0, 1);if (obj.value.length > 1 && firstNum == "0") {obj.value = "0";} }//先把非數(shù)字的都替換掉，除了數(shù)字和.obj.value = obj.value.replace(/[^/d.]/g, "");//必須保證第一個為數(shù)字而不是.obj.value = obj.value.replace(/^/./g, "");//保證只有出現(xiàn)一個.而沒有多個.obj.value = obj.value.replace(//.{2,}/g, ".");//保證.只出現(xiàn)一次，而不能出現(xiàn)兩次以上obj.value = obj.value.replace(".", "$#$").replace(//./g, "").replace("$#$", ".");}