以下是 Lazyload图片延迟加载效果特效代码 的示例演示效果:
部分效果截图:
HTML代码(index.html):
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<meta name="keywords" content="JS代码,图片特效,JS广告代码,JS特效代码" />
<meta name="description" content="此代码内容为Lazyload图片延迟加载效果，属于站长常用代码" />
<title>Lazyload图片延迟加载效果</title>
<script src="js/lrtk.min.js"></script>
<script>
var LazyLoad = function(elems, options) {
//初始化程序
this._initialize(elems, options);
//如果没有元素就退出
if ( this.isFinish() ) return;
//初始化模式设置
this._initMode();
//进行第一次触发
this.resize(true);
};
LazyLoad.prototype = {
//初始化程序
_initialize: function(elems, options) {
this._elems = elems;//加载元素集合
this._rect = {};//容器位置参数对象
this._range = {};//加载范围参数对象
this._loadData = null;//加载程序
this._timer = null;//定时器
this._lock = false;//延时锁定
//静态使用属性
this._index = 0;//记录索引
this._direction = 0;//记录方向
this._lastScroll = { "left": 0, "top": 0 };//记录滚动值
this._setElems = function(){};//重置元素集合程序
var opt = this._setOptions(options);
this.delay = opt.delay;
this.threshold = opt.threshold;
this.beforeLoad = opt.beforeLoad;
this._onLoadData = opt.onLoadData;
this._container = this._initContainer($$(this.options.container));//容器
},
//设置默认属性
_setOptions: function(options) {
this.options = {//默认值
container: window,//容器
mode: "dynamic",//模式
threshold: 0,//加载范围阈值
delay: 100,//延时时间
beforeLoad: function(){},//加载前执行
onLoadData: function(){}//显示加载数据
};
return $$.extend(this.options, options || {});
},
//初始化容器设置
_initContainer: function(container) {
var doc = document,
isWindow = container == window || container == doc
|| !container.tagName || (/^(?:body|html)$/i).test( container.tagName );
if ( isWindow ) {
container = doc.compatMode == 'CSS1Compat' ? doc.documentElement : doc.body;
}
//定义执行方法
var oThis = this, width = 0, height = 0;
this.load = $$F.bind( this._load, this );
this.resize = $$F.bind( this._resize, this );
this.delayLoad = function() { oThis._delay( oThis.load ); };
this.delayResize = function(){//防止重复触发bug
var clientWidth = container.clientWidth,
clientHeight = container.clientHeight;
if( clientWidth != width || clientHeight != height ) {
width = clientWidth; height = clientHeight;
oThis._delay( oThis.resize );
}
};
//记录绑定元素方便移除
this._binder = isWindow ? window : container;
//绑定事件
$$E.addEvent( this._binder, "scroll", this.delayLoad );
isWindow && $$E.addEvent( this._binder, "resize", this.delayResize );
//获取容器位置参数函数
this._getContainerRect = isWindow && ( "innerHeight" in window )
? function(){ return {
"left": 0, "right": window.innerWidth,
"top": 0, "bottom":window.innerHeight
}}
: function(){ return oThis._getRect(container); } ;
//设置获取scroll值函数
this._getScroll = isWindow
? function() { return {
"left": $$D.getScrollLeft(), "top": $$D.getScrollTop()
}}
: function() { return {
"left": container.scrollLeft, "top": container.scrollTop
}};
return container;
},
//初始化模式设置
_initMode: function() {
switch ( this.options.mode.toLowerCase() ) {
case "vertical" ://垂直方向
this._initStatic( "vertical", "vertical" );
break;
case "horizontal" ://水平方向
this._initStatic( "horizontal", "horizontal" );
break;
case "cross" :
case "cross-vertical" ://垂直正交方向
this._initStatic( "cross", "vertical" );
break;
case "cross-horizontal" ://水平正交方向
this._initStatic( "cross", "horizontal" );
break;
case "dynamic" ://动态加载
default :
this._loadData = this._loadDynamic;
}
},
//初始化静态加载设置
_initStatic: function(mode, direction) {
//设置模式
var isVertical = direction == "vertical";
if ( mode == "cross" ) {
this._crossDirection = $$F.bind( this._getCrossDirection, this,
isVertical ? "_verticalDirection" : "_horizontalDirection",
isVertical ? "_horizontalDirection" : "_verticalDirection" );
}
//设置元素
var pos = isVertical ? "top" : "left",
sortFunction = function( x, y ) { return x._rect[ pos ] - y._rect[ pos ]; },
getRect = function( elem ) { elem._rect = this._getRect(elem); return elem; };
this._setElems = function() {//转换数组并排序
this._elems = $$A.map( this._elems, getRect, this ).sort( sortFunction );
};
//设置加载函数
this._loadData = $$F.bind( this._loadStatic, this,
"_" + mode + "Direction",
$$F.bind( this._outofRange, this, mode, "_" + direction + "BeforeRange" ),
$$F.bind( this._outofRange, this, mode, "_" + direction + "AfterRange" ) );
},
//延时程序
_delay: function(run) {
clearTimeout(this._timer);
if ( this.isFinish() ) return;
var oThis = this, delay = this.delay;
if ( this._lock ) {//防止连续触发
this._timer = setTimeout( function(){ oThis._delay(run); }, delay );
} else {
this._lock = true; run();
setTimeout( function(){ oThis._lock = false; }, delay );
}
},
//重置范围参数并加载数据
_resize: function(change) {
if ( this.isFinish() ) return;
this._rect = this._getContainerRect();
//位置改变的话需要重置元素位置
if ( change ) { this._setElems(); }
this._load(true);
},
//加载程序
_load: function(force) {
if ( this.isFinish() ) return;
var rect = this._rect, scroll = this._getScroll(),
left = scroll.left, top = scroll.top,
threshold = Math.max( 0, this.threshold | 0 );
//记录原始加载范围参数
this._range = {
top: rect.top + top - threshold,
bottom: rect.bottom + top + threshold,
left: rect.left + left - threshold,
right: rect.right + left + threshold
}
//加载数据
this.beforeLoad();
this._loadData(force);
},
//动态加载程序
_loadDynamic: function() {
this._elems = $$A.filter( this._elems, function( elem ) {
return !this._insideRange( elem );
}, this );
},
//静态加载程序
_loadStatic: function(direction, beforeRange, afterRange, force) {
//获取方向
direction = this[ direction ]( force );
if ( !direction ) return;
//根据方向历遍图片对象
var elems = this._elems, i = this._index,
begin = [], middle = [], end = [];
if ( direction > 0 ) {//向后滚动
begin = elems.slice( 0, i );
for ( var len = elems.length ; i < len; i++ ) {
if ( afterRange( middle, elems[i] ) ) {
end = elems.slice( i + 1 ); break;
}
}
i = begin.length + middle.length - 1;
} else {//向前滚动
end = elems.slice( i + 1 );
for ( ; i >= 0; i-- ) {
if ( beforeRange( middle, elems[i] ) ) {
begin = elems.slice( 0, i ); break;
}
}
middle.reverse();
}
this._index = Math.max( 0, i );
this._elems = begin.concat( middle, end );
},
//垂直和水平滚动方向获取程序
_verticalDirection: function(force) {
return this._getDirection( force, "top" );
},
_horizontalDirection: function(force) {
return this._getDirection( force, "left" );
},
//滚动方向获取程序
_getDirection: function(force, scroll) {
var now = this._getScroll()[ scroll ], _scroll = this._lastScroll;
if ( force ) { _scroll[ scroll ] = now; this._index = 0; return 1; }
var old = _scroll[ scroll ]; _scroll[ scroll ] = now;
return now - old;
},
//cross滚动方向获取程序
_getCrossDirection: function(primary, secondary, force) {
var direction;
if ( !force ) {
direction = this[ primary ]();
secondary = this[ secondary ]();
if ( !direction && !secondary ) {//无滚动
return 0;
} else if ( !direction ) {//次方向滚动
if ( this._direction ) {
direction = -this._direction;//用上一次的相反方向
} else {
force = true;//没有记录过方向
}
} else if ( secondary && direction * this._direction >= 0 ) {
force = true;//同时滚动并且方向跟上一次滚动相同
}
}
if ( force ) {
this._lastScroll = this._getScroll(); this._index = 0; direction = 1;
}
return ( this._direction = direction );
},
//判断是否加载范围内
_insideRange: function(elem, mode) {
var range = this._range, rect = elem._rect || this._getRect(elem),
insideH = rect.right >= range.left && rect.left <= range.right,
insideV = rect.bottom >= range.top && rect.top <= range.bottom,
inside = {
"horizontal": insideH,
"vertical": insideV,
"cross": insideH && insideV
}[ mode || "cross" ];
//在加载范围内加载数据
if ( inside ) { this._onLoadData(elem); }
return inside;
},
//判断是否超过加载范围
_outofRange: function(mode, compare, middle, elem) {
if ( !this._insideRange( elem, mode ) ) {
middle.push(elem);
return this[ compare ]( elem._rect );
}
},
_horizontalBeforeRange: function(rect) { return rect.right < this._range.left; },
_horizontalAfterRange: function(rect) { return rect.left > this._range.right; },
_verticalBeforeRange: function(rect) { return rect.bottom < this._range.top; },
_verticalAfterRange: function(rect) { return rect.top > this._range.bottom; },
//获取位置参数
_getRect: function(node) {
var n = node, left = 0, top = 0;
while (n) { left += n.offsetLeft; top += n.offsetTop; n = n.offsetParent; };
return {
"left": left, "right": left + node.offsetWidth,
"top": top, "bottom": top + node.offsetHeight
};
},
//是否完成加载
isFinish: function() {
if ( !this._elems || !this._elems.length ) {
this.dispose(); return true;
} else {
return false;
}
},
//销毁程序
dispose: function(load) {
clearTimeout(this._timer);
if ( this._elems || this._binder ) {
//加载全部元素
if ( load && this._elems ) {
$$A.forEach( this._elems, this._onLoadData, this );
}
//清除关联
$$E.removeEvent( this._binder, "scroll", this.delayLoad );
$$E.removeEvent( this._binder, "resize", this.delayResize );
this._elems = this._binder = null;
}
}
}
</script>
<style>
.lazy{ width:600px;overflow:scroll;border:1px solid #ccc;}
.lazy table{border-collapse:collapse;}
.lazy td{border:1px solid #ccc;text-align:center;padding:20px;background:#FFF;}
#idLazyContainer{height:250px;*position:relative;}
#idLazyContainer table{position:relative;}
#idLazyContainer div{width:140px;height:100px;line-height:100px;position:relative;}
</style>
</head>
<body style="text-align:center">
模式：
<select id="idMode">
<option value="cross-vertical">垂直正交方向</option>
<option value="cross-horizontal">水平正交方向</option>
<option value="vertical">垂直方向</option>
<option value="horizontal">水平方向</option>
<option value="dynamic">动态加载</option>
</select>
阈值：
<input id="idRange" type="text" size="5" maxlength="3">
<input id="idReset" type="button" value="重新开始">
<input id="idRandom" type="button" value="随机位置">
<input id="idWindow" type="button" value="窗口模式">
<center>
<div class="lazy" id="idLazyContainer">
<table cellspacing="0" cellpadding="0">
<tbody id="idLazy">
</tbody>
</table>
</div>
</center>
<script>
function Lazy(lazycontainer, random){
var table = $$("idLazy"), totalX = 10, totalY = 10, i = 0,
container = $$("idLazyContainer"), color = [1,1,1];
lazycontainer = lazycontainer || container;
while(table.firstChild){ table.removeChild(table.firstChild); }
for ( var n = 0; n < totalY; n++ ) {
var row = table.appendChild(document.createElement("tr"));
for ( var m = 0; m < totalX; m++ ) {
if ( random ) {
var css = "style='" + $$A.map(["left", "top"], function(style){
return style + ":" + (Math.floor(Math.random() * 100) - 50) + "px;";
}).join("") + "'";
}
row.appendChild(document.createElement("td")).innerHTML = "<div " + css + "></div>";
}
};
setTimeout(function(){//ie6渲染bug
var lazy = new LazyLoad( container.getElementsByTagName("div"), {
container: lazycontainer || container,
mode: $$("idMode").value,
threshold: $$("idRange").value | 0,
beforeLoad: function() {
color = $$A.map(color, function(){ return Math.floor((Math.random() * 255)); });
},
onLoadData: function(elem) {
elem.innerHTML = "第 " + ++i + " 个加载";
elem.style.backgroundColor = "rgb(" + color.join(",") + ")";
elem.style.color = "rgb(" + $$A.map(color, function(x){ return 255 - x; } ).join(",") + ")";
}
});
$$("idReset").onclick = function(){
lazy.dispose(); Lazy(lazycontainer, random);
}
var style = container.style;
$$("idWindow").onclick = function(){
if( this.value == "窗口模式" ){
lazy.dispose();
if ( $$B.ie6 ) {
container.scrollTop = container.scrollLeft = 0;
style.overflow = "hidden"; style.position = "static";
} else {
style.overflow = "visible";
}
Lazy(window, random);
this.value = "容器模式"
}else{
lazy.dispose();
if ( $$B.ie6 ) {
style.position = "relative";
}
style.overflow = "scroll";
Lazy(container, random);
this.value = "窗口模式";
}
}
$$("idRandom").onclick = function(){
if( this.value == "随机位置" ){
lazy.dispose(); Lazy(lazycontainer, true);
this.value = "固定位置"
}else{
lazy.dispose(); Lazy(lazycontainer, false);
this.value = "随机位置";
}
}
},0);
}
Lazy();
</script>
</body>
</html>
JS代码(lrtk.min.js):
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e=function(c){
return(c<62?'':e(parseInt(c/62)))+((c=c%62)>35?String.fromCharCode(c+29):c.toString(36))}
;
if('0'.replace(0,e)==0){
while(c--)r[e(c)]=k[c];
k=[function(e){
return r[e]||e}
];
e=function(){
return'([3-59cf-hj-mo-rt-yCG-NP-RT-Z]|[12]\\w)'}
;
c=1}
;
while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);
return p}
('5 $$,$$B,$$A,$$F,$$D,$$E,$$S;
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9(c)4 c;
c=1G.c;
c.pageX=c.clientX+D.1u(c.1N);
c.pageY=c.clientY+D.1t(c.1N);
c.target=c.1N;
c.1O=1O;
c.1P=1P;
switch(c.t){
2m"mouseout":c.2n=c.toElement;
1b;
2m"mouseover":c.2n=c.fromElement;
1b}
;
4 c}
;
3 1O(){
12.cancelBubble=1d}
;
3 1P(){
12.1x=w}
;
4{
"1i":1i,"1j":1j,"1f":1f}
}
)();
S={
1K:3(s){
4 s.2k(/-([a-z])/ig,3(all,2o){
4 2o.toUpperCase()}
)}
}
;
9(B.1V){
try{
G.execCommand("BackgroundImageCache",w,1d)}
catch(e){
}
}
;
$$=O;
$$B=B;
$$A=A;
$$F=F;
$$D=D;
$$E=E;
$$S=S}
)();
',[],149,'|||function|return|var||||if|||event|||object|from|style||name|thisp|ret|node||left|elem|callback|element||type|rect|array|false|test|handler||||arguments||||document|destination|for|else|ua|call|len|top||property|in|apply||elt|right|bottom|events|handlers|each|opacity||source|this|msie|doc|value||guid|copy|prototype|version|break|length|true|slice|fixEvent|defaultView|elems|addEvent|removeEvent||vMark|indexOf|isNaN|Math|lastIndexOf|filter|fun|args|getScrollTop|getScrollLeft|currentStyle|handleEvent|returnValue|typeof|ins|subclass|opera|chrome|RegExp||parseInt|window|sLeft|sTop|alpha|camelize|runtimeStyle||srcElement|stopPropagation|preventDefault|string||parent|safari|firefox|ie6|ie8|obj|Array|ceil|floor|forEach|push|item|method|concat|ownerDocument|documentElement|scrollTop|body|scrollLeft|contains|getBoundingClientRect|getComputedStyle|null|100|float|styleFloat||rsLeft|replace|addEventListener|case|relatedTarget|letter'.split('|'),0,{
}
))
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