javascript - jQuery .each 函数不保留全局变量

Question

我有一个函数，我希望运行 .each 循环并返回值的运行总计

在我的 .each 函数末尾，amountSold 变量为 0，并且在 .each 循环期间，它显示为未定义。我做错了什么？

function processChange(currentTarget) {
    var amountSold = 0;  //VARIABLE DECLARED
    //limit these operations to the currentlySelected tab
    var availableFundContainer = $(currentTarget).closest(".available-content").parent();

    var fundBeingSold = $(availableFundContainer.children(0)).attr('data-investment-code');

    availableFundContainer.find('.available-handler').each(function (index, val) {       
        var origVal = $(this).attr('data-original-value');
        var currentSliderVal = $(this).next('.available-content').find('.slider').slider("value");
        var amountSold = amountSold + (origVal - currentSliderVal); //PROBLEM LINE!!!!!
....}

Answer 1

您正在each回调函数内创建一个本地范围的变量，也称为amountSold。

替换

var amountSold = amountSold + (origVal - currentSliderVal); //PROBLEM LINE!!!!!

与

amountSold += (origVal - currentSliderVal); //PROBLEM LINE!!!!!