如何从javascript调用方法后面的多个代码

问题描述：

如何从JavaScript调用方法后面的多个代码?

目前我正在使用
但是我认为第一个第二种方法是同时调用，
我想要的是，如果第一种方法调用成功，那么
仅应调用第二种方法.

那我该怎么做呢?

下面的代码:

How can I call multiple code behind method from JavaScript?

Currently I am using
But I think first second method is call simultaneously,
what I want, if first method is called successfully then
only second method should be called.

So how can I make this possible?

Code below:

function OnResetDataClick() {
      var UserEmail = document.getElementById("ContentPlaceHolder1_UserName1");
      var val = UserEmail.value;
      var usedata= "";

      var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
      if (reg.test(val) == false) {
      }
      else {
        
        var getPassword = {
          type: "POST",
          url: "GetData.aspx/GetDataMethod",
          data: "",
          contentType: "application/json; charset=utf-8",
          dataType: "json",
          success: function (response) {
            usedata= response.d;

          },
          error: function (result) {
            alert("Error");
          }
        };

        //Call the PageMethods
        $.ajax(getPassword);
       
      // Calling second Page Method
      if (usedata!= "") {
        var options = {
          type: "POST",
          url: "GetData.aspx/SendData",
          data: "{'toMailAddress':'" + val + "','usefulldata':'" + usedata+ "'}",
          contentType: "application/json; charset=utf-8",
          dataType: "json",
          success: function (response) {
            var val1 = response.d;
            alert(val1);
          },
          error: function (result) {
            alert("Error in " + result);
          }
        };

        //Call the PageMethods
        $.ajax(options);
        // }
      }

    }

答

/; 如果(reg.test(val)== false ){ } 其他 { var getPassword = { 类型:" ，网址:" ，数据:" ， contentType:" ， dataType:" ，成功:功能(响应){ usedata = response.d; }，错误:函数(结果){ alert(" )； } }; // 调用PageMethods

/; if (reg.test(val) == false) { } else { var getPassword = { type: "POST", url: "GetData.aspx/GetDataMethod", data: "", contentType: "application/json; charset=utf-8", dataType: "json", success: function (response) { usedata= response.d; }, error: function (result) { alert("Error"); } }; //Call the PageMethods

.ajax(getPassword); // 调用第二个页面方法如果(usedata！= " ) { var 选项= { 类型:" ， url:" ，数据:" + val + " + usedata + " ， contentType:" ， dataType:" ，成功:功能(响应){ var val1 = response.d; alert(val1); }，错误:函数(结果){ alert(" +结果中的错误); } }; // 调用PageMethods

.ajax(getPassword); // Calling second Page Method if (usedata!= "") { var options = { type: "POST", url: "GetData.aspx/SendData", data: "{'toMailAddress':'" + val + "','usefulldata':'" + usedata+ "'}", contentType: "application/json; charset=utf-8", dataType: "json", success: function (response) { var val1 = response.d; alert(val1); }, error: function (result) { alert("Error in " + result); } }; //Call the PageMethods

.ajax(options); // } } }

如何从javascript调用方法后面的多个代码

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