Question

js 验证提交不能用 没通过照样可以提交

JS
function doLogin(){
var usr = document.getElementById("usr");
if (usr.value==""){
alert("名称不能为空");
usr.focus();
return false;
}

return true;
}

HTML
<form action="add.asp" method="post" id="form1" onsubmit="javascript:doLogin();">

Answer 1

把代码中的

<form action="add.asp" method="post" id="form1" onsubmit="javascript:doLogin();">

改为
<form action="add.asp" method="post" id="form1" onsubmit="return doLogin();">

Answer 2

<form action="add.asp" method="post" id="form1" onsubmit="return doLogin();"> 加个return,换掉javascript:

Answer 3

<form action="add.asp" method="post" id="form1" onsubmit="javascript:return doLogin();">

Answer 4

onsubmit="return doLogin();"