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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>跟随对联广告-豪情</title>
<meta name="viewport" content="initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
<style type="text/css">
*{margin:0;padding:0;}
body{ font:12px/1.125 Microsoft YaHei; background:#fff; }
ul,li{list-style:none;}
a{text-decoration:none;}
.wrap{width:600px;height:350px;margin:10px auto;border:1px solid #ccc;}
.inner{padding:15px;}
.clearfix{overflow:hidden;_zoom:1;}
.none{display:none;}
.banner{width:100px;height:300px;position:absolute;top:200px;}
.banner:nth-child(1){left:100px;}
.banner:nth-child(2){right:100px;}
</style>
</head>
<body>
<div style="height:3000px"></div>
<div style="display:none;">
<div id="div" style="width:100px;height:200px;background:#000;"></div>
<button id="btn">test</button>
</div>
<script>
(function(){
var dog = {
$ : function(id){
return document.querySelector(id);
},
tpl : function(html, data){
return html.replace(/{{(\w+)}}/g, function(item, a){
return data[a];
});
},
pos : function(obj, attr){
if(obj){
return obj.getBoundingClientRect()[attr];
} else {
alert('对象不存在！');
}
},
viewSize: function(){
var de = document.documentElement;
return {
'width': (window.innerWidth || (de && de.clientWidth) || doc.body.clientWidth),
'height': (window.innerHeight || (de && de.clientHeight) || doc.body.clientHeight)
};
}(),
on: function(el, type, handler){
el.addEventListener(type, handler, false);
},
off: function(el, type, handler){
el.removeEventListener(type, handler, false);
},
css : function(obj, attr){
if(obj.currentStyle){
return obj.currentStyle[attr];
} else {
return getComputedStyle(obj, false)[attr];
}
},
act : function(obj, attr, target){
var that = this;
clearInterval(obj.timer);
obj.timer = setInterval(function(){
var stop = true;
var cur = parseInt(that.css(obj, attr));
var speed = (target - cur) / 8;
speed = speed < 0 ? Math.ceil(speed) : Math.floor(speed);
if(target != speed){
stop = false;
}
obj.style[attr] = speed + cur + 'px';
if(stop){
clearInterval(obj.timer);
}
}, 55);
},
each : function(arr, callback){
if(Array.isArray(arr)){
for(var i = 0, l = arr.length; i < l; i++){
if(callback.call(arr[i], i, arr[i++]) == false){
break;
}
}
} else {
for(var name in arr){
if(callback.call(arr[name], name, arr[name]) == false){
break;
}
}
}
},
create : function(opt){
var el = document.createElement(opt.tag || 'div');
this.each(opt, function(i, m){
el[i] = this;
});
return el;
}
}
function Adv(){
var args = arguments[0];
for(var i in args){
this[i] = args[i];
}
this.init();
}
Adv.prototype = {
init : function(){
this.render();
this.bind();
},
render : function(){
var div = dog.create({ className : 'out'}),
a = dog.create({ className : 'banner'}),
b = null;
a.innerHTML = this.tpl;
b = a.cloneNode(true);
div.appendChild(a);
div.appendChild(b);
document.body.appendChild(div);
this.a = a;
this.b = b;
},
bind : function(){
var that = this,
doc = document,
scrollTop = 0,
t = 0;
dog.on(window, 'scroll', function(){
scrollTop = doc.documentElement.scrollTop || doc.body.scrollTop;
t = scrollTop + (doc.documentElement.clientHeight - that.a.offsetHeight) / 2;
dog.act(that.a, 'top', t);
dog.act(that.b, 'top', t);
});
},
getDom : function(){
}
}
var defaults = {
id : 'dialog',
tpl : '<img src="images/ad.jpg" alt="">'
}
new Adv(defaults);
}());
</script>
</body>
</html>