类方法作为JavaScript中的事件处理程序？ [英] Class methods as event handlers in JavaScript?
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问题描述
有JavaScript的最佳实践或常见方法，让类成员作为事件处理程序吗？
Is there a best-practice or common way in JavaScript to have class members as event handlers?
考虑下面的简单示例：
<head>
<script language="javascript" type="text/javascript">
ClickCounter = function(buttonId) {
this._clickCount = 0;
document.getElementById(buttonId).onclick = this.buttonClicked;
}
ClickCounter.prototype = {
buttonClicked: function() {
this._clickCount++;
alert('the button was clicked ' + this._clickCount + ' times');
}
}
</script>
</head>
<body>
<input type="button" id="btn1" value="Click me" />
<script language="javascript" type="text/javascript">
var btn1counter = new ClickCounter('btn1');
</script>
</body>
事件处理程序buttonClicked被调用，但是_clickCount成员不可访问，或 this <
The event handler buttonClicked gets called, but the _clickCount member is inaccessible, or this points to some other object.
有关这类问题的任何好的提示/文章/资源？
Any good tips/articles/resources about this kind of problems?
推荐答案
ClickCounter = function(buttonId) {
this._clickCount = 0;
var that = this;
document.getElementById(buttonId).onclick = function(){ that.buttonClicked() };
}
ClickCounter.prototype = {
buttonClicked: function() {
this._clickCount++;
alert('the button was clicked ' + this._clickCount + ' times');
}
}
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