如何扩展 Array.prototype.push()? [英] How can I extend Array.prototype.push()?
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问题描述
我正在尝试扩展 Array.push 方法,以便使用 push 会触发回调方法,然后执行正常的数组功能.
I'm trying to extend the Array.push method so that using push will trigger a callback method and then perform the normal array function.
我不太确定如何执行此操作,但这里有一些我一直在使用但未成功的代码.
I'm not quite sure how to do this, but here's some code I've been playing with unsuccessfully.
arr = [];
arr.push = function(data){
//callback method goes here
this = Array.push(data);
return this.length;
}
arr.push('test');
推荐答案
由于 push 允许推送多个元素,我使用下面的 arguments 变量让真正的 push 方法有所有参数.
Since push allows more than one element to be pushed, I use the arguments variable below to let the real push method have all arguments.
这个解决方案只影响 arr 变量:
This solution only affects the arr variable:
arr.push = function () {
//Do what you want here...
return Array.prototype.push.apply(this, arguments);
}
此解决方案会影响所有阵列.我不建议你这样做.
This solution affects all arrays. I do not recommend that you do that.
Array.prototype.push = (function() {
var original = Array.prototype.push;
return function() {
//Do what you want here.
return original.apply(this, arguments);
};
})();
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