48 lines
1.7 KiB
JavaScript
48 lines
1.7 KiB
JavaScript
var oli1 = document.getElementById('erweima');
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var odiv1 = document.getElementsByClassName('erlist');
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var oli2 = document.getElementById('totel');
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var odiv2 = document.getElementsByClassName('tellist');
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oli1.onmouseover = function(){
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odiv1[0].style.display = 'block';
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};
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oli1.onmouseout = function(){
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odiv1[0].style.display = 'none';
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};
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oli2.onmouseover = function(){
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odiv2[0].style.display = 'block';
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};
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oli2.onmouseout = function(){
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odiv2[0].style.display = 'none';
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};
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function goTop(acceleration, time) {
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acceleration = acceleration || 0.1;
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time = time || 20;
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var x1 = 0;
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var y1 = 0;
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var x2 = 0;
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var y2 = 0;
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var x3 = 0;
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var y3 = 0;
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if (document.documentElement) {
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x1 = document.documentElement.scrollLeft || 0;
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y1 = document.documentElement.scrollTop || 0;
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}
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if (document.body) {
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x2 = document.body.scrollLeft || 0;
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y2 = document.body.scrollTop || 0;
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}
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var x3 = window.scrollX || 0;
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var y3 = window.scrollY || 0;
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// 滚动条到页面顶部的水平距离
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var x = Math.max(x1, Math.max(x2, x3));
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// 滚动条到页面顶部的垂直距离
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var y = Math.max(y1, Math.max(y2, y3));
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// 滚动距离 = 目前距离 / 速度, 因为距离原来越小, 速度是大于 1 的数, 所以滚动距离会越来越小
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var speed = 1 + acceleration;
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window.scrollTo(Math.floor(x / speed), Math.floor(y / speed));
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// 如果距离不为零, 继续调用迭代本函数
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if (x > 0 || y > 0) {
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var invokeFunction = "goTop(" + acceleration + ", " + time + ")";
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window.setTimeout(invokeFunction, time);
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}
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}; |