<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>form表单提交</title>
</head>
<body>
<form action="JS09.html" method="post" id="f">
<input type="text" id="a">
<input type="submit" value="提交" />
</form>
</body>
<script>
var f = document.getElementById('f');
//输入框获取
var a = document.getElementById('a');
//提交表单的事件监听
f.onsubmit = function (){
//判断是否存在内容
if(a.value==''){
alert('内容为空，请填写用户名');
//阻止提交表单
return false;
}
else {
alert('提交成功')
//可以提交表单
return true;
}
}
</script>
</html>
在JS中写form表单的提交与判断
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转载自blog.csdn.net/qq_37768482/article/details/76099603
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