[英]Cannot access the function inside the other function
This is how my inventoryList() function is called and I cannot change it.这就是我的inventoryList() function 的调用方式,我无法更改它。
if (operationInfo[0] === 'add') {
inventoryList().add(operationInfo[1]);
But I have a method inside my inventoryList function like below but it states obj.add is not a function?但是我的inventoryList function 中有一个方法,如下所示,但它指出obj.add 不是function? why?
为什么?
function inventoryList(){
const add = (name) => {
// adds string to inv and if item exists doesn't add. Adds to log also as objects maintain no position
if(!(name in inv)){
inv[name] = name;
entries.push(name)
}
};
}
In order to use the add
function, you should return if from your inventoryList
function.为了使用
add
function,您应该从您的inventoryList
列表中返回 function。
function inventoryList() {
const add = (name) => {
if (!(name in inv)) {
inv[name] = name;
entries.push(name)
}
};
return { add };
}
Althought, if you are going to use it like that, I recommend changing the inventoryList
to class with add
as its method.不过,如果您打算这样使用它,我建议将
inventoryList
更改为class,并使用add
作为其方法。
class InventoryList {
add(name) {
if (!(name in inv)) {
inv[name] = name;
entries.push(name)
}
}
}
You can than use it like this你可以像这样使用它
const invList = new InventoryList();
if (operationInfo[0] === 'add') {
invList.add(operationInfo[1]);
}
inventoryList
is not returning anything. inventoryList
没有返回任何东西。 Return an object which contains reference to the function you want to execute.返回一个 object,其中包含对您要执行的 function 的引用。 Also
_add
is an inner function which is private to inventoryList
so have to expose it to use it另外
_add
是一个内部 function ,它是inventoryList
私有的,所以必须公开它才能使用它
function execute() { inventoryList().add('hello') } function inventoryList() { const _add = (name) => { console.log(name) // rest of code }; return { add: _add, // add other function if it is there } }
<button onclick='execute()'>Execute</button>
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