检测是否支持事件监听器

Yes, you can feature-detect this. Create an element, listen for the event, and change an attribute on the element. In my tests, you don't even have to add the element to the DOM tree, making this a nice, contained feature detection.

例子:

function isDOMAttrModifiedSupported() {
    var p, flag;

    flag = false;
    p = document.createElement('p');
    if (p.addEventListener) {
        p.addEventListener('DOMAttrModified', callback, false);
    }
    else if (p.attachEvent) {
        p.attachEvent('onDOMAttrModified', callback);
    }
    else {
        // Assume not
        return false;
    }
    p.setAttribute('id', 'target');
    return flag;

    function callback() {
        flag = true;
    }
}

实时复制

Firefox 触发上述所有修改的回调；Chrome 都没有.