删除通过绑定添加的事件侦听器

问题描述

在 JavaScript 中，使用 bind() 删除作为事件侦听器添加的函数的最佳方法是什么?

In JavaScript, what is the best way to remove a function added as an event listener using bind()?

示例

(function(){

    // constructor
    MyClass = function() {
        this.myButton = document.getElementById("myButtonID");
        this.myButton.addEventListener("click", this.clickListener.bind(this));
    };

    MyClass.prototype.clickListener = function(event) {
        console.log(this); // must be MyClass
    };

    // public method
    MyClass.prototype.disableButton = function() {
        this.myButton.removeEventListener("click", ___________);
    };

})();

我能想到的唯一方法是跟踪每个添加了 bind 的监听器.

The only way I can think of is to keep track of every listener added with bind.

上面这个方法的例子:

(function(){

    // constructor
    MyClass = function() {
        this.myButton = document.getElementById("myButtonID");
        this.clickListenerBind = this.clickListener.bind(this);
        this.myButton.addEventListener("click", this.clickListenerBind);
    };

    MyClass.prototype.clickListener = function(event) {
        console.log(this); // must be MyClass
    };

    // public method
    MyClass.prototype.disableButton = function() {
        this.myButton.removeEventListener("click", this.clickListenerBind);
    };

})();

有没有更好的方法来做到这一点?

Are there any better ways to do this?

推荐答案

虽然@machineghost 说的是对的，但事件的添加和删除方式相同，但等式中缺失的部分是:

Although what @machineghost said was true, that events are added and removed the same way, the missing part of the equation was this:

.bind() 被调用后会创建一个新的函数引用.

参见绑定()更改函数引用?|如何永久设置?

因此，要添加或删除它，请将引用分配给变量:

So, to add or remove it, assign the reference to a variable:

var x = this.myListener.bind(this);
Toolbox.addListener(window, 'scroll', x);
Toolbox.removeListener(window, 'scroll', x);

这对我来说按预期工作.

This works as expected for me.

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