Question

我有这个功能。但是如何从我的2个txt文件函数中获取数据？我希望在我的警报中输出Tabt值。

        function getWeight(){

            var fileKevin = "https://dl.dropboxusercontent.com/s/mytextfile1.txt";
            var fileHeidi = "https://dl.dropboxusercontent.com/s/mytextfile1.txt";


            //GET DATA FOR KEVIN
            $.get(fileKevin,function(txt){
                var lines = txt.split("\n");

                var total = parseInt(lines.length)
                var first = parseInt(0)
                var last = parseInt(total-1)
                var prev = parseInt(total-2)

                var NuVaegt =  (splitWeight(lines[last],1))
                var StartVaegt = splitWeight(lines[first],1);
                var ForrigeVaegt = splitWeight(lines[prev],1)
                var Tabt = decimal((NuVaegt-StartVaegt),1)
                var Sidst = decimal((NuVaegt-ForrigeVaegt),1)
                return Tabt;
            });

            //GET DATA FOR HEIDI
            $.get(fileHeidi,function(txt){
                var lines = txt.split("\n");

                var total = parseInt(lines.length)
                var first = parseInt(0)
                var last = parseInt(total-1)
                var prev = parseInt(total-2)

                var NuVaegt =  (splitWeight(lines[last],1))
                var StartVaegt = splitWeight(lines[first],1);
                var ForrigeVaegt = splitWeight(lines[prev],1)
                var Tabt = decimal((NuVaegt-StartVaegt),1)
                var Sidst = decimal((NuVaegt-ForrigeVaegt),1)
                return Tabt;


            });

       alert(Tabt) //function Kevin
       alert(Tabt) //function Heidi


        };//end getWeight

你可以帮帮我吗？

请忽略这一点：添加文字添加文字

添加文字

Answer 1

您无法从$.get之类的异步函数返回数据，您必须使用回调。您得到的是延期或承诺对象，您可以这样分组：

var call1 = $.get(fileKevin...
var call2 = $.get(fileHeidi...

$.when( call1, call2 ).done(function ( txtKevin, txtHeidi ) {

结帐$.when

你应该重构，因为你有重复的代码

示例：

function getWeight() {

    var fileKevin = "https://dl.dropboxusercontent.com/s/mytextfile1.txt";
    var fileHeidi = "https://dl.dropboxusercontent.com/s/mytextfile1.txt";

    $.when(
        $.get(fileKevin),
        $.get(fileHeidi)
    ).done(function (txtKevin, txtHeidi) {
        var weightKevin = parseWeight(txtKevin),
            weightHeidi = parseWeight(txtHeidi);
        console.log(weightKevin, weightHeidi);
        // here you will call any function that has to use those values like:
        // doSomething(weightKevin, weightHeidi);
    });

    function parseWeight(txt) {
        var lines = txt.split("\n");

        var total = parseInt(lines.length)
        var first = parseInt(0)
        var last = parseInt(total-1)
        var prev = parseInt(total-2)

        var NuVaegt =  (splitWeight(lines[last],1))
        var StartVaegt = splitWeight(lines[first],1);
        var ForrigeVaegt = splitWeight(lines[prev],1)
        var Tabt = decimal((NuVaegt-StartVaegt),1)
        var Sidst = decimal((NuVaegt-ForrigeVaegt),1)
        return Tabt;
    }

};

如何从函数中的函数返回数据

1 个答案: