在JS中从另一个调用一个方法
[英]Calling one method from another in JS
问题描述
I have the following snippet of JS 
我有以下JS片段
var Customer : function()
{
this.ShipProduct : function()
{
//Logic for shipping product. If shipping successful, notify user
//Here I am trying to call Notify
//this.Notify(); // does not work
}
this.Notify = function()
{
//Logic for notify
}
}
How would I call Notify from ShipProduct? 我怎么称呼ShipProduct的通知？
4 个解决方案
解决方案1
8 已采纳 2010-08-20 22:31:28
That is not JS, that is a collection of syntax errors. 不是JS，而是语法错误的集合。
Use = when assigning variables, and : inside simple objects, don't confuse simple objects and functions, don't forget commas, and don't prefix property names with this. 在分配变量时使用= ，在简单对象内部使用: ，不要混淆简单对象和函数，不要忘记逗号，也不要在属性名称前添加前缀this. . 。
var Customer = {
ShipProduct : function()
{
//Logic for shipping product. If shipping successful, notify user
//Here I am trying to call Notify
this.Notify(); // this does work
},
Notify: function()
{
//Logic for notify
}
}
Customer.ShipProduct();
解决方案2
1 2010-08-20 22:41:01
This seems to work: 这似乎可行：
<html>
<head>
<script type = "text/javascript" language = "JavaScript">
var Customer = function(){
this.ShipProduct = function(){
alert("hey!");
this.Notify();
};
this.Notify = function(){
//Logic for notify
alert("notify");
};
};
</script>
</head>
<body>
<script type = "text/javascript" language = "JavaScript">
var cust = new Customer();
cust.ShipProduct();
</script>
</body>
</html>
解决方案3
1 2010-08-20 23:08:54
This example looks fine except for the first line, that colon should be an equal sign. 除了第一行，该示例看起来还不错，冒号应该是等号。
The problem, I'm guessing, has to do with how you're calling ShipProduct . 我猜，这个问题与您如何称呼ShipProduct 。 If you're doing it like this, everything should work: 如果您这样做的话，那么一切都会正常进行：
var customer = new Customer();
customer.ShipProduct();
However if you detach the method and call it directly, it won't work. 但是，如果您分离该方法并直接调用它，它将无法工作。 Such as: 如：
var customer = new Customer();
var shipMethod = customer.ShipProduct;
shipMethod();
This is because JavaScript relies on the dot notation accessor to bind this . 这是因为JavaScript依靠点表示法访问器来绑定 this 。 I'm guessing that you're passing the method around, perhaps to an Ajax callback or something. 我猜想您正在传递该方法，也许是传递给Ajax回调之类的东西。
What you need to do in that case it wrap it in a function. 在这种情况下，您需要做的是将其包装在一个函数中。 Such as: 如：
var customer = new Customer();
var shipMethod = function() {
customer.shipMethod();
};
... later, in some other context ...
shipMethod();
解决方案4
0 2010-08-20 22:35:00
How about: 怎么样：
var Customer = function() {
var notify = function() {
...
};
var shipProduct = function() {
...
notify(...);
...
};
return {
notify: notify,
shipProduct: shipProduct
};
}
This assumes that you want to expose both functions -- if notify is only used by Customer internally, then there's no need to expose it, so you would instead return like so: 假设您要公开这两个函数-如果notify仅由Customer内部使用，则无需公开它，因此您可以这样返回：
return {
shipProduct: shipProduct
};
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