源码 // Zepto.js // (c) 2010-2015 Thomas Fuchs // Zepto.js may be freely distributed under the MIT license. var Zepto = (function() { //定义局部变量 concat = emptyArray.concat 缩短作用域链 var undefined, key, $, classList, emptyArray = [], concat = emptyArray.conc
点击返回顶部 function goTop(acceleration, time) { acceleration = acceleration || 0.1; time = time || 16; var x1 = 0; var y1 = 0; var x2 = 0; var y2 = 0; var x3 = 0; var y3 = 0; if (document.documentElement) { x1 = document.documentElement.scrollLeft || 0;