form表单中存在submit按钮时可以在form元素中加上 onSubmit="return false"

html
<form id="member_form" onSubmit="return false">
    <label><input type="text" name="tel" placeholder="请输入手机号" class="Fname"></label>
    <label><input type="password" name="password" placeholder="请输入密码" class="Fmim"></label>
    <label><input type="submit" id="login" value="登录" class="Flogin_go"></label>
</form>

js
<script>
    //登录
    $("#member_form").submit(function(){
        var form_str = $("#member_form").serialize();
        $.post("/Public/login",    $("#member_form").serialize(),function(str){
            var obj = JSON.parse(str);
            if(obj.code=='0'){
                alert("登录成功");
                window.location.href = "/";
            }else{
                alert(obj.message);
            }
        });
    });
 </script>