如何使用Modernizr.js测试DOM4 Mutation Observers？

Question

I'm trying to create a test to detect for Mutation Observers using Modernizr.js. On the Modernizer Documentation, there's a section for testing DOM elements known as prefixes. I tried that using:

Modernizr.load({
    test: Modernizr.prefixed('MutationObserver', window),
    yep: ['/js/polyfill_yep.js'],
    nope: ['/js/polyfill_nope.js']
});

But obviously, that isn't working. I'm getting a TypeError: f.bind is not a function I'm fairly certain the prefixed string isn't MutationObserver, but I don't know what it could be, or even if I'm writing the test correctly. Any ideas?

Answer 1

Here's a win!

Modernizr.load({
    test: MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver,
    yep: '/js/mutations.js',
    nope: '/js/mutation_fallback.js'
});