javascript - 在 IE 中导致 "slow running script"警告的 knockout

Question

我有一个可观察值和已计算可观察值的网格。第一行包含用作下面所有行中值的乘数的百分比。用户可以编辑百分比值，Knockout 会处理所有级联更新。我还需要一个单独的文本框，用户可以在其中输入将应用于网格中每个百分比的新百分比。

初始绑定(bind)工作正常，更新 1 个百分比的费率也工作正常。

当用户在文本框中输入一个值并且我遍历 View 模型更新每个百分比以匹配时，会出现 javascript 警告。网格列实际上是月度值，因此更新百分比的循环仅执行 12 次。

我试过 throttle 延长器，但没有解决问题。有什么想法吗？

更新:不确定它是否有帮助，但我添加了一些代码

$("#NewRate").change(function (e) {
    var newRate = parseFloat($(this).val());
    for (var i = 0; i < 12; i++) {
        viewModel.resourceCategory.monthAmounts[i].amount(newRate);
    }
});

function ConvertToDate(jsonDateString) {
    var re = /-?\d+/;
    var m = re.exec(jsonDateString);
    return new Date(parseInt(m[0]));
}

function MonthAmount(amount, dateKey) {
    var self = this;
    self.amount = ko.observable(amount).extend({ throttle: 1 }); //using the throttle to avoid "long running script" warning in IE
    self.dateKey = ConvertToDate(dateKey);
    self.monthIndex = self.dateKey.getMonth();
}

function ResourceCategory(name, monthAmounts) {
    var self = this;
    self.name = name;

    self.monthAmounts = ko.utils.arrayMap(monthAmounts, function (monthAmount) {
        return new MonthAmount(monthAmount.Amount, monthAmount.DateKey);
    });

    self.totalAmount = ko.computed(function () {
        var sum = 0;
        for (var i = 0; i < self.monthAmounts.length; i++) {
            sum += parseFloat(self.monthAmounts[i].amount());
        }
        return sum.toFixed(2);
    }).extend({ throttle: 1 }); //using the throttle to avoid "long running script" warning in IE

    self.averageAmount = ko.computed(function () {
        return (self.totalAmount() / self.monthAmounts.length).toFixed(2);
    }).extend({ throttle: 1 }); //using the throttle to avoid "long running script" warning in IE

}
function ResourceCategoriesMonthTotal(monthIndex, resourceCategories) {
    var self = this;
    self.monthIndex = monthIndex;
    self.dateKey = new Date(new Date().getFullYear(), monthIndex, 1);
    self.amount = ko.computed(function () {
        var val = 0;
        for (var i = 0; i < resourceCategories.length; i++) {
            val += parseFloat(resourceCategories[i].monthAmounts[self.monthIndex].amount());
        }
        return (val).toFixed(2);
    }).extend({ throttle: 1 }); //using the throttle to avoid "long running script" warning in IE
}

self.resourceCategoriesMonthTotals = new Array();
for (var monthIndex = 0; monthIndex < 12; monthIndex++) {
    self.resourceCategoriesMonthTotals.push(new ResourceCategoriesMonthTotal(monthIndex, self.resourceCategories));
}

self.resourceCategoriesTotal = ko.computed(function () {
    var val = 0;
    for (var i = 0; i < self.resourceCategoriesMonthTotals.length; i++) {
        val += parseFloat(self.resourceCategoriesMonthTotals[i].amount());
    }
    return (val / self.resourceCategoriesMonthTotals.length).toFixed(2);
}).extend({ throttle: 1 }); //using the throttle to avoid "long running script" warning in IE

Answer 1

听起来问题出在你身上

loop through the view model updating each of the percentage rates to match

如果是这样，那么 IE 的一个答案是使用 timeout(0) 调用屈服于浏览器。当您的 JS 在超时后恢复时，执行循环的下一次迭代，然后再超时。

完成此操作后，如果我嗅探到它是 IE 浏览器，我只会执行超时。否则，不需要。