_qk

封装dom和bom的位置和尺寸信息
/*
 * 获取元素距离, 基于元素的外轮廓左上顶点计算(外轮廓包括border/padding/margin)
 * @public
 * @param  {object} 目标dom对象
 * @param  {object} 目标dom对象
 * @returns {object} 2个dom的坐上顶点间的x, y距离
 */
_qk.getD = _qk.getDistance = (dom1, dom2) => {
    var rect1 = dom1.getBoundingClientRect();
    if(undefined === dom2) {
        var rect2 = {top: 0, left: 0};
    } else {
        var rect2 = dom2.getBoundingClientRect();
    }
    return {
        x: rect1.left - rect2.left,
        y: rect1.top - rect2.top
    };
};

/*
 * 获取元素外轮廓宽度(外轮廓包括border/padding/margin)
 * @public
 * @param  {object} dom/window
 * @returns {number} 元素外轮廓宽度
 */
_qk.getW = _qk.getWidth = (obj) => {
    if(undefined == obj || obj.window === window) {
        return window.innerWidth;

} else {
        return obj.getBoundingClientRect().width;
    }

};

/*
 * 获取元素外轮廓高度(外轮廓包括border/padding/margin)
 * @public
 * @param  {object} dom/window
 * @returns {number} 元素外轮廓高度
 */
_qk.getH = _qk.getHeight = (obj) => {
    if(undefined == obj || obj.window === window) {
        return window.innerHeight;
    } else {
        return obj.getBoundingClientRect().height;
    }
}

/*
 * 获取元素距离浏览器顶部的距离
 * @public
 * @param  {object} 目标dom对象
 * @returns {number} 元素外轮廓高度
 */
_qk.getT = _qk.getTop = (dom) => {
    return dom.getBoundingClientRect().top + window.pageYOffset - document.documentElement.clientTop;
}

/*
 * 获取元素距离浏览器左侧的距离
 * @public
 * @param  {object} 目标dom对象
 * @returns {number} 元素外轮廓高度
 */
_qk.getL = _qk.getLeft = (dom) => {
    return dom.getBoundingClientRect().left + window.pageXOffset - document.documentElement.clientLeft;
}

/*
 * 缩短getBoundingClientRect
 * @public
 * @param  {object} 目标dom对象
 * @returns {object} 元素轮廓描述
 */    
_qk.getBCR = (dom) => {
    return dom.getBoundingClientRect();
}

/*
 * 获取目标滚动条的高度
 * @public
 * @param  {object} dom/window
 * @returns {number} 目标的滚动条高度
 */   
_qk.getST = _qk.getScrollTop = (obj) => {
    if(obj.window === window) {
        return obj.pageYOffset;
    } else {
        return dom.scrollTop;
    }
}

/*
 * 获取目标滚动条的左侧长度
 * @public
 * @param  {object} dom/window
 * @returns {number} 目标滚动条的左侧长度
 */   
_qk.getSL = _qk.getScrollLeft = (obj) => {
    if(obj.window === window) {
        return obj.pageXOffset;
    } else {
        return obj.scrollLeft;
    }        
}
any86 / qk

_qk

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