如何将 JQuery 回调函数与 Javascript 对象一起使用
我有一个 Javascript 对象如下：
function extraFields(id) {
this.numActiveFields = 0;
...
this.addRow = function(quoteClass, rowClass) {
var remButton = $("<span></span>")
.addClass(rowClass)
.addClass(quoteClass)
.click(function() {
//here I want to refer to the object's variable, but instead refer
//to the JQuery object
this.numActiveFields++;
});
}
...
}
我想从回调函数内部更改对象的变量。我该怎么做呢？我应该改变声明对象的方式吗？
I have a Javascript object the following:
function extraFields(id) {
this.numActiveFields = 0;
...
this.addRow = function(quoteClass, rowClass) {
var remButton = $("<span></span>")
.addClass(rowClass)
.addClass(quoteClass)
.click(function() {
//here I want to refer to the object's variable, but instead refer
//to the JQuery object
this.numActiveFields++;
});
}
...
}
I want to change the object's variable from inside the callback function. How would I do that? Should I change the way I declare the object?
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评论（1）
当您在回调函数中时，“this”就是您创建的“remButton”。只需在回调之前将“this”保存在变量中，然后使用它即可。
要获得更好的解释，请查看 mplungjan 建议的链接：
从 jQuery 中的回调函数引用对象
When you are in the callback function "this" is the "remButton" you created. Just save "this" in a variable before the callback and then use that instead.
For a better explanation please look at the link that mplungjan suggested:
Reference to an object from a callback function in jQuery