What's the best way to detect if a given Javas

问题:

This question already has an answer here:

• JavaScript isDOM — How do you check if a JavaScript Object is a DOM Object? 32 answers

Say for instance I was writing a function that was designed to accept multiple argument types:

var overloaded = function (arg) {
    if (is_dom_element(arg)) {
        // Code for DOM Element argument...
    }
};

What's the best way to implement is_dom_element so that it works in a cross-browser, fairly accurate way?

回答1:

jQuery checks the nodeType property. So you would have:

var overloaded = function (arg) {
    if (arg.nodeType) {
        // Code for DOM Element argument...
    }
};

Although this would detect all DOM objects, not just elements. If you want elements alone, that would be:

var overloaded = function (arg) {
    if (arg.nodeType && arg.nodeType == 1) {
        // Code for DOM Element argument...
    }
};

回答2:

Probably this one here:

node instanceof HTMLElement

That should work in most browsers. Otherwise you have to duck-type it (eg. typeof x.nodeType != 'undefined')

回答3:

What about

obj instanceof HTMLElement