JS实现仿UC浏览器前进后退效果的实例代码

var startx, starty, endx, endy, moveX, moveY, seatX, seatY; 
var clickState = false; 
//获取输入框dom元素 
var text = document.forms[“form”]; 
//设置样式 
function setCss(obj) { 
var cssStr = “z-index:5;width:37px;height:37px;position:absolute;left:” 
+ seatX + ‘px;top:' + seatY + ‘px;'; 
//将样式添加到div上，显示div 
obj.style.cssText = cssStr;
}
//计算位置 
function setPosition(obj) { 
if (obj == ‘left') { 
seatX = text.offsetLeft - 37; //横坐标 
} else { 
seatX = text.offsetLeft + text.offsetWidth; //横坐标 
} 
seatY = (text.offsetTop + text.offsetHeight) / 2; //纵坐标 
} 
//创建DIV 
function createDiv(obj) { 
//首先创建div 
var descDiv = document.createElement(‘div'); 
document.body.appendChild(descDiv); 
//给div设置样式，比如大小、位置 
setPosition(obj); 
setCss(descDiv); 
descDiv.innerHTML = ”; 
descDiv.id = obj; 
descDiv.style.display = ‘block'; 
addElementImg(descDiv.id); 
} 
//添加IMG 
function addElementImg(obj) { 
var div = document.getElementById(obj); 
//添加 img 
var img = document.createElement(“img”); 
//设置 img 属性，如 id 
img.setAttribute(“id”, “newImg”); 
//设置 img 图片地址 
img.src = “/Themes/TheThemeMachine/Images/” + obj + “.png”; 
div.appendChild(img); 
} 
//删除DIV 
function removeDiv(obj) { 
var el = document.getElementById(obj); 
el.parentNode.removeChild(el); 
} 
//移动DIV 
function moveDiv(obj, movex) { 
if (Math.abs(movex) < 37) { 
var div = document.getElementById(obj); 
setPosition(obj); 
seatX = seatX + movex; 
setCss(div); 
} 
} 
//根据位移改变DIV的位置 
function reductionDiv(obj) { 
var div = document.getElementById(obj); 
setPosition(obj); 
setCss(div); 
} 
//计算移动坐标 
function calculationMoveCoordinate() { 
moveX = endx - startx; 
moveY = Math.abs(endy - starty); 
if (moveX > 0) 
moveDiv(“left”, moveX); 
else 
moveDiv(“right”, moveX); 
} 
//判断是否是PC端 
function IsPC() { 
var userAgentInfo = navigator.userAgent; 
var Agents = new Array(“Android”, “iPhone”, “SymbianOS”, “Windows Phone”, “iPad”, “iPod”); 
var flag = true; 
for (var v = 0; v < Agents.length; v++) { 
if (userAgentInfo.indexOf(Agents[v]) > 0) { flag = false; break; } 
} 
return flag; 
} 
//PC端鼠标按下 
function click() { 
clickState = true; 
startx = event.clientX; 
starty = event.clientY; 
} 
//PC端鼠标移动 
function pull() { 
if (1 == event.which) //判断左键是否按下 
{ 
endx = event.clientX; 
endy = event.clientY; 
calculationMoveCoordinate(); 
} 
} 
//PC端和移动端位移结束 
function stopClick() { 
if (Math.abs(moveX) > 37 && moveY < 20) { 
if (moveX < 0) { 
history.Go(1); 
} else { 
history.go(-1); 
} 
} else { 
reductionDiv(“left”); 
reductionDiv(“right”); 
} 
} 
////移动端注册事件 
document.addEventListener(‘touchmove', function (event) { 
event.preventDefault(); 
}, false); 
//touchstart事件 
function touchSatrtFunc(evt) { 
//evt.preventDefault(); //阻止触摸时浏览器的缩放、滚动条滚动等 
var touch = evt.touches[0]; //获取第一个触点 
startx = Number(touch.pageX); //页面触点X坐标 
starty = Number(touch.pageY); //页面触点Y坐标 
}
//touchmove事件，这个事件无法获取坐标 
function touchMoveFunc(evt) { 
//evt.preventDefault(); //阻止触摸时浏览器的缩放、滚动条滚动等 
var touch = evt.touches[0]; //获取第一个触点 
endx = Number(touch.pageX); //页面触点X坐标 
endy = Number(touch.pageY); //页面触点Y坐标 
calculationMoveCoordinate(); 
}
//touchend事件 
function touchEndFunc(evt) { 
//evt.preventDefault(); //阻止触摸时浏览器的缩放、滚动条滚动等 
stopClick(); 
}
//加载 
if (IsPC()) { 
document.onmousedown = click; 
document.onmousemove = pull; 
document.onmouseup = stopClick; 
} else { 
document.addEventListener(‘touchstart', touchSatrtFunc, false); 
document.addEventListener(‘touchmove', touchMoveFunc, false); 
document.addEventListener(‘touchend', touchEndFunc, false); 
} 
createDiv(‘left'); 
createDiv(‘right');