[英]Pass a global variable to a function for reassignment in javascript
I am trying to create a helper function that in part takes in a global variable for reassignment. 我正在尝试创建一个辅助函数,该函数部分接受全局变量以进行重新分配。 Trying to avoid using eval to make this work. 尝试避免使用eval来完成这项工作。
let oneQuestionCount,
twoQuestionCount,
oneQuestionsChecked,
twoQuestionsChecked;
function hideFadeIn(divToHide, divToShow, countItem = null, checkedItem = null) {
$("div#item-" + divToHide).hide();
$("div#item-" + divToShow).fadeIn();
if (countItem) {
countItem = $("div#item-" + divToShow + " :input").length; // want the global var to be changed not the function scope var
}
if (checkedItem) {
checkedItem = $("div#item-" + divToHide + " :checked").length; // want the global var to be changed not the function scope var
}
hideFadeIn(
"one",
"two",
twoQuestionCount, // how to pass in and change globally?
oneQuestionsChecked // how to pass in and change globally?
);
console.log(twoQuestionCount, oneQuestionsChecked); // should be reassinged value by the function.
There will be multiple function calls and other global variables that need to be assigned - hence the helper function. 将需要分配多个函数调用和其他全局变量-因此需要辅助函数。 ex: hideFadeIn("one","two",twoQuestionCount, oneQuestionsChecked); 例如:hideFadeIn(“一个”,“两个”,twoQuestionCount,一个问题已检查); then hideFadeIn("two","three",threeQuestionCount, twoQuestionsChecked); 然后hideFadeIn(“ two”,“ three”,threeQuestionCount,twoQuestionsChecked); then hideFadeIn("three","four",threeQuestionCount, fourQuestionsChecked); 然后hideFadeIn(“三个”,“四个”,三个问题计数,四个问题选中); etc... 等等...
You can't do that. 你不能那样做。 When you pass twoQuestionCount
into hideFadeIn
, its value is passed, not the variable. 当您将twoQuestionCount
传递给hideFadeIn
,将传递其值 ,而不是变量。
If you like, you could put those in an object, and then pass in the object: 如果愿意,可以将它们放在一个对象中,然后传递该对象:
let whatever = {
oneQuestionCount: 0,
twoQuestionCount: 0,
oneQuestionsChecked: 0,
twoQuestionsChecked: 0
};
then 然后
hideFadeIn("one", "two", whatever);
hideFadeIn
can change the properties on the object it receives. hideFadeIn
可以更改其接收的对象的属性。
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