判断是不是DOM元素

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function isElement(obj: any) {
    try {
        // Using W3 DOM2 (works for FF, Opera and Chrome)
        return obj instanceof HTMLElement;
    } catch (e) {
        // Browsers not supporting W3 DOM2 don't have HTMLElement and
        // an exception is thrown and we end up here. Testing some
        // properties that all elements have (works on IE7)
        return (
            typeof obj === 'object' &&
            obj.nodeType === 1 &&
            typeof obj.style === 'object' &&
            typeof obj.ownerDocument === 'object'
        );
    }
}