比较 javascript 中的 2 个元素的最有效方法是什么？

Question

Here's my code to make txtKeyword input to have focus when the user presses a key.

var txtKeyword = document.getElementById("txtKeyword");
...
document.addEventListener("keypress", function(event) {
    if(event.srcElement == txtKeyword)
    {
        return;
    }
    txtKeyword.focus();
}

I need to compare the elements to know if the message sender is the element on which I want to focus fail.

event.srcElement == txtKeyword
event.srcElement.id == "txtKeyword"
event.srcElement === txtKeyword

These comparison which is faster? Considering id is a string, if the element's id is long, this way would not a ideal way.

Answer 1

My guess is that the last one should be the fastest because it doesn't do any coercion.