获取浏览器可视区宽高

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参考：https://www.cnblogs.com/pengchengzhong/p/6050644.html
获取浏览器可视区宽高要考虑兼容情况

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function getViewXY () {
	let w = window,
    d = document,
    e = d.documentElement,
    g = d.getElementsByTagName('body')[0],
    x = w.innerWidth || e.clientWidth || g.clientWidth,
    y = w.innerHeight|| e.clientHeight|| g.clientHeight;
    return {width: x, height: y}
}