JS相当于jQuery .is()

Question

是否有纯粹的JS等同于jQuery .is()(仅限现代浏览器).

我知道有querySelector,但我想检查节点本身,而不是找到子节点.

Answer 1

看起来matchesSelector就是我想要的。

https://developer.mozilla.org/zh-CN/docs/Web/API/Element.matches

Polyfill在这里：

https://gist.github.com/jonathantneal/3062955

this.Element && function(ElementPrototype) {
    ElementPrototype.matchesSelector = ElementPrototype.matchesSelector || 
    ElementPrototype.mozMatchesSelector ||
    ElementPrototype.msMatchesSelector ||
    ElementPrototype.oMatchesSelector ||
    ElementPrototype.webkitMatchesSelector ||
    function (selector) {
        var node = this, nodes = (node.parentNode || node.document).querySelectorAll(selector), i = -1;

        while (nodes[++i] && nodes[i] != node);

        return !!nodes[i];
    }
}(Element.prototype);