问题描述
|
在“ 0”对象中,在错误的上下文中(文本框元素的上下文)调用了onkeydown事件处理程序“ 1”,但需要在“ 2”的上下文中调用它。如何才能做到这一点?
function SomeObj(elem1,elem2) {
this.textboxElem = elem1;
this.someElem = elem2;
this.registerEvent();
}
SomeObj.prototype = {
registerEvent: function() {
this.textboxElem.onkeydown = this.doSomething;
},doSomething: function() {
// this must not be textboxElem
alert(this);
this.someElem.innerHTML = \"123\";
}
};
解决方法
将引用复制到局部变量,以便可以在闭包中使用它:
registerEvent: function() {
var t = this;
this.textboxElem.onkeydown = function() {
t.doSomething();
};
},