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无缝切换效果

2024-10-15 14:36:39   214人阅读

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title></title>
        <link rel="stylesheet" href="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/css/bootstrap.min.css">
        <style>
*{margin: 0;padding: 0;}
li{list-style: none;}
ul{position: absolute;}
li{width: 100px;height: 100px;float: left;text-align:center;line-height: 100px;box-sizing: border-box;border:1px solid red;}
#box{width: 400px;height: 100px;overflow: hidden;position: relative;border:1px solid blue;margin:20px auto;}
.clearfix:after{display:block;content:".";height: 0;visibility:hidden;clear:both;}
div.box2{width: 400px;margin: 0 auto;}
        </style>
    </head>
    <body>
        <div id="box">
            <ul id="list" class="clearfix">
                <li>1</li>
                <li>2</li>
                <li>3</li>
                <li>4</li>
                <li>5</li>
            </ul>
        </div>
        <div class="box2">
            <button id="btn" class="btn btn-primary btn-block">切换</button>
        </div>
        <script src="http://www.mamicode.com/animate.js"></script>
        <script>
var box=document.getElementById("box");
var li=document.getElementsByTagName("li");
var ul=document.getElementById("list");
var btn=document.getElementById("btn");
var iTrue=true;
function getWidth(){
    ul.style.width = li.length*(li[0].offsetWidth) + ‘px‘;
}
getWidth();
btn.onclick=function(){
    if(iTrue){
        iTrue=false;
        for(var i=0;i<4;i++){
            var oli=li[i].cloneNode(true);
            ul.appendChild(oli);
            getWidth();
        }
    }
    ul.animate({"left":"-400px"},function(){
        for(var i=0;i<4;i++){
            ul.removeChild(li[0]);
            ul.style.left=0;
        }
        iTrue=true;
    });
}
        </script>
    </body>
</html>

　　引用的animate方法：

Element.prototype.animate=animate;
Element.prototype.getStyle=getStyle;
function animate(json,callback) {
    clearInterval(this.timer);
    for (var attr in json) {
        var that = this;
        this.timer = setInterval(function () {
            if (attr == ‘opacity‘) {
                that.icur = Math.round(parseFloat(that.getStyle()[attr]) * 100);
            } else {
                that.icur = parseInt(that.getStyle()[attr]);
            }
            that.speed = (parseInt(json[attr]) - that.icur) / 10;
            that.speed = that.speed > 0 ? Math.ceil(that.speed) : Math.floor(that.speed);
            if (attr == ‘opacity‘) {
                that.style.filter = ‘alpha(opacity:‘ + that.icur + that.speed + ‘)‘;
                that.style.opacity = (that.icur + that.speed) / 100;
            } else {
                that.style[attr] = that.icur + that.speed + "px";
            };
            if(that.icur==parseInt(json[attr])){
                //flags=true;
                clearInterval(that.timer);
                if(callback){
                    callback();
                }
            }
        }, 20);
    }
}
function getStyle() {
    if (this.currentStyle) {
        return this.currentStyle;
    } else {
        return document.defaultView.getComputedStyle(this, null);
    }
}

　　

无缝切换效果


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