你需要 apply 上下文中的事件处理程序那个元素：

You need to apply the event handler in the context of that element:

var elem = document.getElementById("linkid");
if (typeof elem.onclick == "function") {
    elem.onclick.apply(elem);
}

否则此会引用上面代码执行的上下文。

Otherwise this would reference the context the above code is executed in.