仿淘宝商品宝贝图片放大效果js特效

发布时间：2014-04-02 13:58:40　来源/作者：学技巧网页制作　分类：图片特效阅读：0次点评一下

<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>ImageZoom 图片放大效果--学技巧网站制作xuejiqiao.com</title> <script src="http://www.xuejiqiao.com/demo/js/2014363.js"></script> <script> var ImageZoom = function(image, viewer, options) { this._initialize( image, viewer, options ); this._initLoad(); }; ImageZoom.prototype = { //初始化程序 _initialize: function(image, viewer, options) { this._image = $$(image);//原图 this._zoom = document.createElement("img");//显示图 this._viewer = $$(viewer);//显示框 this._viewerWidth = 0;//显示框宽 this._viewerHeight = 0;//显示框高 this._preload = new Image();//预载对象 this._rect = null;//原图坐标 this._repairLeft = 0;//显示图x坐标修正 this._repairTop = 0;//显示图y坐标修正 this._rangeWidth = 0;//显示范围宽度 this._rangeHeight = 0;//显示范围高度 this._timer = null;//计时器 this._loaded = false;//是否加载 this._substitute = false;//是否替换 var opt = this._setOptions(options); this._scale = opt.scale; this._max = opt.max; this._min = opt.min; this._originPic = opt.originPic; this._zoomPic = opt.zoomPic; this._rangeWidth = opt.rangeWidth; this._rangeHeight = opt.rangeHeight; this.delay = opt.delay; this.autoHide = opt.autoHide; this.mouse = opt.mouse; this.rate = opt.rate; this.onLoad = opt.onLoad; this.onStart = opt.onStart; this.onMove = opt.onMove; this.onEnd = opt.onEnd; var oThis = this, END = function(){ oThis._end(); }; this._END = function(){ oThis._timer = setTimeout( END, oThis.delay ); }; this._START = $$F.bindAsEventListener( this._start, this ); this._MOVE = $$F.bindAsEventListener( this._move, this ); this._MOUSE = $$F.bindAsEventListener( this._mouse, this ); this._OUT = $$F.bindAsEventListener( function(e){ if ( !e.relatedTarget ) this._END(); }, this ); $$CE.fireEvent( this, "init" ); }, //设置默认属性 _setOptions: function(options) { this.options = {//默认值 scale: 0,//比例(大图/原图) max: 10,//最大比例 min: 1.5,//最小比例 originPic: "",//原图地址 zoomPic: "",//大图地址 rangeWidth: 0,//显示范围宽度 rangeHeight:0,//显示范围高度 delay: 20,//延迟结束时间 autoHide: true,//是否自动隐藏 mouse: false,//鼠标缩放 rate: .2,//鼠标缩放比率 onLoad: $$.emptyFunction,//加载完成时执行 onStart: $$.emptyFunction,//开始放大时执行 onMove: $$.emptyFunction,//放大移动时执行 onEnd: $$.emptyFunction//放大结束时执行 }; return $$.extend(this.options, options || {}); }, //初始化加载 _initLoad: function() { var image = this._image, originPic = this._originPic, useOrigin = !this._zoomPic && this._scale, loadImage = $$F.bind( useOrigin ? this._loadOriginImage : this._loadImage, this ); //设置自动隐藏 this.autoHide && this._hide(); //先加载原图 if ( originPic && originPic != image.src ) {//使用自定义地址 image.onload = loadImage; image.src = originPic; } else if ( image.src ) {//使用元素地址 if ( !image.complete ) {//未载入完 image.onload = loadImage; } else {//已经载入 loadImage(); } } else { return;//没有原图地址 } //加载大图 if ( !useOrigin ) { var preload = this._preload, zoomPic = this._zoomPic || image.src, loadPreload = $$F.bind( this._loadPreload, this ); if ( zoomPic != preload.src ) {//新地址重新加载 preload.onload = loadPreload; preload.src = zoomPic; } else {//正在加载 if ( !preload.complete ) {//未载入完 preload.onload = loadPreload; } else {//已经载入 this._loadPreload(); } } } }, //原图放大加载程序 _loadOriginImage: function() { this._image.onload = null; this._zoom.src = this._image.src; this._initLoaded(); }, //原图加载程序 _loadImage: function() { this._image.onload = null; if ( this._loaded ) {//大图已经加载 this._initLoaded(); } else { this._loaded = true; if ( this._scale ) {//有自定义比例才用原图放大替换大图 this._substitute = true; this._zoom.src = this._image.src; this._initLoaded(); } } }, //大图预载程序 _loadPreload: function() { this._preload.onload = null; this._zoom.src = this._preload.src; if ( this._loaded ) {//原图已经加载 //没有使用替换 if ( !this._substitute ) { this._initLoaded(); } } else { this._loaded = true; } }, //初始化加载设置 _initLoaded: function(src) { //初始化显示图 this._initSize(); //初始化显示框 this._initViewer(); //初始化数据 this._initData(); //开始执行 $$CE.fireEvent( this, "load" ); this.onLoad(); this.start(); }, //初始化显示图尺寸 _initSize: function() { var zoom = this._zoom, image = this._image, scale = this._scale; if ( !scale ) { scale = this._preload.width / image.width; } this._scale = scale = Math.min( Math.max( this._min, scale ), this._max ); //按比例设置显示图大小 zoom.width = Math.ceil( image.width * scale ); zoom.height = Math.ceil( image.height * scale ); }, //初始化显示框 _initViewer: function() { var zoom = this._zoom, viewer = this._viewer; //设置样式 var styles = { padding: 0, overflow: "hidden" }, p = $$D.getStyle( viewer, "position" ); if ( p != "relative" && p != "absolute" ){ styles.position = "relative"; }; $$D.setStyle( viewer, styles ); zoom.style.position = "absolute"; //插入显示图 if ( !$$D.contains( viewer, zoom ) ){ viewer.appendChild( zoom ); } }, //初始化数据 _initData: function() { var zoom = this._zoom, image = this._image, viewer = this._viewer, scale = this._scale, rangeWidth = this._rangeWidth, rangeHeight = this._rangeHeight; //原图坐标 this._rect = $$D.rect( image ); //修正参数 this._repairLeft = image.clientLeft + parseInt($$D.getStyle( image, "padding-left" )); this._repairTop = image.clientTop + parseInt($$D.getStyle( image, "padding-top" )); //设置范围参数和显示框大小 if ( rangeWidth > 0 && rangeHeight > 0 ) { rangeWidth = Math.ceil( rangeWidth ); rangeHeight = Math.ceil( rangeHeight ); this._viewerWidth = Math.ceil( rangeWidth * scale ); this._viewerHeight = Math.ceil( rangeHeight * scale ); $$D.setStyle( viewer, { width: this._viewerWidth + "px", height: this._viewerHeight + "px" }); } else { var styles; if ( !viewer.clientWidth ) {//隐藏 var style = viewer.style; styles = { display: style.display, position: style.position, visibility: style.visibility }; $$D.setStyle( viewer, { display: "block", position: "absolute", visibility: "hidden" }); } this._viewerWidth = viewer.clientWidth; this._viewerHeight = viewer.clientHeight; if ( styles ) { $$D.setStyle( viewer, styles ); } rangeWidth = Math.ceil( this._viewerWidth / scale ); rangeHeight = Math.ceil( this._viewerHeight / scale ); } this._rangeWidth = rangeWidth; this._rangeHeight = rangeHeight; }, //开始 _start: function() { clearTimeout( this._timer ); var viewer = this._viewer, image = this._image, scale = this._scale; viewer.style.display = "block"; $$CE.fireEvent( this, "start" ); this.onStart(); $$E.removeEvent( image, "mouseover", this._START ); $$E.removeEvent( image, "mousemove", this._START ); $$E.addEvent( document, "mousemove", this._MOVE ); $$E.addEvent( document, "mouseout", this._OUT ); this.mouse && $$E.addEvent( document, $$B.firefox ? "DOMMouseScroll" : "mousewheel", this._MOUSE ); }, //移动 _move: function(e) { clearTimeout( this._timer ); var x = e.pageX, y = e.pageY, rect = this._rect; if ( x < rect.left || x > rect.right || y < rect.top || y > rect.bottom ) { this._END();//移出原图范围 } else { var pos = {}, scale = this._scale, zoom = this._zoom, viewerWidth = this._viewerWidth, viewerHeight = this._viewerHeight; //修正坐标 pos.left = viewerWidth / 2 - ( x - rect.left - this._repairLeft ) * scale; pos.top = viewerHeight / 2 - ( y - rect.top - this._repairTop ) * scale; $$CE.fireEvent( this, "repair", e, pos ); //范围限制 x = Math.ceil(Math.min(Math.max( pos.left, viewerWidth - zoom.width ), 0)); y = Math.ceil(Math.min(Math.max( pos.top, viewerHeight - zoom.height ), 0)); //设置定位 zoom.style.left = x + "px"; zoom.style.top = y + "px"; $$CE.fireEvent( this, "move", e, x, y ); this.onMove(); } }, //结束 _end: function() { $$CE.fireEvent( this, "end" ); this.onEnd(); this.autoHide && this._hide(); this.stop(); this.start(); }, //隐藏 _hide: function() { this._viewer.style.display = "none"; }, //鼠标缩放 _mouse: function(e) { this._scale += ( e.wheelDelta ? e.wheelDelta / (-120) : (e.detail || 0) / 3 ) * this.rate; var opt = this.options; this._rangeWidth = opt.rangeWidth; this._rangeHeight = opt.rangeHeight; this._initSize(); this._initData(); this._move(e); e.preventDefault(); }, //开始 start: function() { if ( this._viewerWidth && this._viewerHeight ) { var image = this._image, START = this._START; $$E.addEvent( image, "mouseover", START ); $$E.addEvent( image, "mousemove", START ); } }, //停止 stop: function() { clearTimeout( this._timer ); $$E.removeEvent( this._image, "mouseover", this._START ); $$E.removeEvent( this._image, "mousemove", this._START ); $$E.removeEvent( document, "mousemove", this._MOVE ); $$E.removeEvent( document, "mouseout", this._OUT ); $$E.removeEvent( document, $$B.firefox ? "DOMMouseScroll" : "mousewheel", this._MOUSE ); }, //修改设置 reset: function(options) { this.stop(); var viewer = this._viewer, zoom = this._zoom; if ( $$D.contains( viewer, zoom ) ) { viewer.removeChild( zoom ); } var opt = $$.extend( this.options, options || {} ); this._scale = opt.scale; this._max = opt.max; this._min = opt.min; this._originPic = opt.originPic; this._zoomPic = opt.zoomPic; this._rangeWidth = opt.rangeWidth; this._rangeHeight = opt.rangeHeight; //重置属性 this._loaded = this._substitute = false; this._rect = null; this._repairLeft = this._repairTop = this._viewerWidth = this._viewerHeight = 0; this._initLoad(); }, //销毁程序 dispose: function() { $$CE.fireEvent( this, "dispose" ); this.stop(); if ( $$D.contains( this._viewer, this._zoom ) ) { this._viewer.removeChild( this._zoom ); } this._image.onload = this._preload.onload = this._image = this._preload = this._zoom = this._viewer = this.onLoad = this.onStart = this.onMove = this.onEnd = this._START = this._MOVE = this._END = this._OUT = null } } </script> </head> <body> <style> .container{ position:relative;} .izImage, .izViewer{border:1px solid #000;background:#fff url('http://www.xuejiqiao.com/demo/img/1.jpg') no-repeat center;} .izImage{width:300px;cursor:crosshair;} .izViewer{width:200px;height:200px;position:absolute;left:320px;top:0;display:none;} .izViewer div{position:absolute;border:0 dashed #999;top:0;left:0;z-index:999;width:100%;height:100%;} </style> <div class="container"> <img id="idImage" class="izImage" src="http://www.xuejiqiao.com/demo/img/1.jpg" /> <div id="idViewer" class="izViewer"> <div style="height:50%;border-bottom-width:1px;"></div> <div style="width:50%;border-right-width:1px;"></div> </div> </div> <br> <input id="idStop" value="暂停" type="button"> <input id="idHide" value="取消隐藏" type="button"> <input id="idRange" value="指定范围" type="button"> <input id="idMouse" value="鼠标缩放" type="button"> <select id="idScale"> <option value="0">按大图放大</option> <option value="2">放大2倍</option> <option value="5">放大5倍</option> <option value="10">放大10倍</option> </select> <br> <br> 原图： <input id="idChangeOrigin" type="text" size="40" value="http://www.xuejiqiao.com/demo/img/1.jpg"> <br> 大图： <input id="idChangeZoom" type="text" size="40" value="http://www.xuejiqiao.com/demo/img/1.jpg"> <br> <input id="idChange" value="换图" type="button"> <input id="idChangeReturn" value="还原" type="button"> <script> var iz = new ImageZoom( "idImage", "idViewer", { onLoad: function(){ $$("idStop").value = "暂停"; } } ); $$("idScale").onchange = function(){ iz.reset({ scale: this.value | 0 }); } $$("idChange").onclick = function(){ iz.reset({ scale: 5, originPic: $$("idChangeOrigin").value, zoomPic: $$("idChangeZoom").value }); $$("idScale").selectedIndex = 2; } $$("idChangeReturn").onclick = function(){ iz.reset({ originPic: "http://www.xuejiqiao.com/demo/img/1.jpg", zoomPic: "" }); } $$("idRange").onclick = function(){ if ( this.value == "指定范围" ) { iz.reset({ rangeWidth: 40, rangeHeight: 40 }); this.value = "自动范围"; } else { $$D.setStyle( $$("idViewer"), { width: "", height: "" } ); iz.reset({ rangeWidth: 0, rangeHeight: 0 }); this.value = "指定范围"; } } $$("idHide").onclick = function(){ if ( this.value == "自动隐藏" ) { iz.autoHide = true; this.value = "取消隐藏"; } else { iz.autoHide = false; iz._viewer.style.display = "block"; this.value = "自动隐藏"; } } $$("idMouse").onclick = function(){ if ( this.value == "鼠标缩放" ) { iz.mouse = true; this.value = "取消缩放"; } else { iz.mouse = false; iz.reset({ scale: $$("idScale").value | 0 }); this.value = "鼠标缩放"; } } $$("idStop").onclick = function(){ if ( this.value == "暂停" ) { iz.stop(); this.value = "继续"; } else { iz.start(); this.value = "暂停"; } } </script> </body> </html>

(www.xuejiqiao.com)提示：可修改后再运行代码!

特效简介：

仿淘宝商品宝贝图片放大效果js特效，让客户更好的了解商品的细节。
这个效果也叫放大镜效果，最早好像在ppg出现的，之后就有了很多仿制品出来了。
一般用于放大查看商品图片，在凡客，京东商城，阿里巴巴等都有类似的效果。
好处是能在原图附近对图片进行局部放大查看，而且可以通过鼠标控制查看的部位。

ImageZoom 图片放大效果有以下特点：
1，支持使用原图放大或新图片设置大图；
2，大图完成载入前使用原图放大代替，减少操作等待时间；
3，支持鼠标滚动缩放大图；
4，可以通过设置显示范围或显示框大小设置显示尺寸；
5，可以设置是否自动隐藏显示框;

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