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JS复习：通过表单提交触发方法
这是最简单的表单提交触发前端JS的验证方法。
HTML部分：
<form onsubmit="return validateForm()">
<label for="name">姓名：</label>
<input type="text" id="name" name="name"><br><br>
<input type="submit" value="提交">
</form>
JS部分：
function validateForm() {
var name = document.getElementById("name").value;
if (name == "") {
alert("姓名不能为空");
return false;
}
}
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