ajax实现加载中...

主要对beforSend:function(){}和 complete:function(){}的应用
具体代码如下:

$.ajax({
    type: "post",
    data: studentInfo,
    contentType: "application/json",
    url: "/Home/Submit",
    beforeSend: function () {
        // 禁用按钮防止重复提交，发送前响应
        $("#submit").attr({ disabled: "disabled" });
    },
    success: function (data) {
        if (data == "Success") {
            //清空输入框
            clearBox();
        }
    },
    complete: function () {//完成响应
        $("#submit").removeAttr("disabled");
    },
    error: function (data) {
        console.info("error: " + data.responseText);
    }
 });

`