推荐朋友的效果--这个效果也叫放大镜效果_凝香

推荐朋友的效果--这个效果也叫放大镜效果_凝香_新浪博客

注：此文章不是本人原创。

<!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</title>
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<script>
var ImageZoom = function(image, viewer, options) {
   this._initialize( image, viewer, options );
   this._initMode( this.options.mode );
   this._oninit();
   this._initLoad();
};
ImageZoom.prototype = {
//初始化程序
_initialize: function(image, viewer, options) {
   this._image = $$(image);//原图
   this._zoom = document.createElement_x_x("img");//显示图
   this._viewer = $$(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 );
},
//设置默认属性
_setOptions: function(options) {
    this.options = {//默认值
       mode:       "simple",//模式
       scale:       0,//比例(大图/原图)
       max:       10,//{zd0}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 $$.extend(this.options, options || {});
},
//根据模式初始化函数属性
_initMode: function(mode) {
   mode = $$.extend({
       options:{},
       init:   $$.emptyFunction,
       load:   $$.emptyFunction,
       start:   $$.emptyFunction,
       end:   $$.emptyFunction,
       move:   $$.emptyFunction,
       dispose:$$.emptyFunction
    }, (ImageZoom._MODE || {})[ mode.toLowerCase() ] || {} );

   this.options = $$.extend( mode.options, this.options );
   this._oninit = mode.init;
   this._onload = mode.load;
   this._onstart = mode.start;
   this._onend = mode.end;
   this._onmove = mode.move;
   this._ondispose = mode.dispose;
},
//初始化加载
_initLoad: function() {
   var image = this._image, originPic = this._originPic,
       useOrigin = !this._zoomPic && this._scale,
       loadImage = $$F.bind( useOrigin ? this._loadOriginImage : this._loadImage, this );
   //设置自动隐藏
   if ( this.autoHide ) { this._viewer.style.display = "none"; }
   //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 = $$F.bind( this._loadPreload, this );
       if ( zoomPic != preload.src ) {//新地址重新加载
           preload.onload = loadPreload;
           preload.src = zoomPic;
       } else {//正在加载
           if ( !preload.complete ) {//未载入完
               preload.onload = loadPreload;
           } else {//已经载入
               this._loadPreload();
           }
       }
   }
},
//原图放大加载程序
_loadOriginImage: function() {
   this._image.onload = null;
   this._zoom.src = this._image.src;
   this._initLoaded();
},
//原图加载程序
_loadImage: function() {
   this._image.onload = null;
   if ( this._loaded ) {//大图已经加载
       this._initLoaded();
   } else {
       this._loaded = true;
       if ( this._scale ) {//有自定义比例才用原图放大替换大图
           this._substitute = true;
           this._zoom.src = this._image.src;
           this._initLoaded();
       }
   }
},
//大图预载程序
_loadPreload: function() {
   this._preload.onload = null;
   this._zoom.src = this._preload.src;
   if ( this._loaded ) {//原图已经加载
       //没有使用替换
       if ( !this._substitute ) { this._initLoaded(); }
   } else {
       this._loaded = true;
   }
},
//初始化加载设置
_initLoaded: function(src) {
   //初始化显示图
   this._initSize();
   //初始化显示框
   this._initViewer();
   //初始化数据
   this._initData();
   //开始执行
   this._onload();
   this.onLoad();
   this.start();
},
//初始化显示图尺寸
_initSize: function() {
   var zoom = this._zoom, image = this._image, scale = this._scale;
   if ( !scale ) { scale = this._preload.width / image.width; }
   this._scale = scale = Math.min( Math.max( this._min, scale ), this._max );
   //按比例设置显示图大小
   zoom.width = Math.ceil( image.width * scale );
   zoom.height = Math.ceil( image.height * scale );
},
//初始化显示框
_initViewer: function() {
   var zoom = this._zoom, viewer = this._viewer;
   //设置样式
   var styles = { padding: 0, overflow: "hidden" }, p = $$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";
   this._onstart();
   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 zoom = this._zoom,
           pos = this._repair(
               x - rect.left - this._repairLeft,
               y - rect.top - this._repairTop
           );
       this._onmove( e, pos );
       //设置定位
       zoom.style.left = pos.left + "px";
       zoom.style.top = pos.top + "px";
       this.onMove();
   }
},
//修正坐标
_repair: function(x, y) {
   var scale = this._scale, zoom = this._zoom,
       viewerWidth = this._viewerWidth,
       viewerHeight = this._viewerHeight;
   //修正坐标
   x = Math.ceil( viewerWidth / 2 - x * scale );
   y = Math.ceil( viewerHeight / 2 - y * scale );
   //范围限制
   x = Math.min( Math.max( x, viewerWidth - zoom.width ), 0 );
   y = Math.min( Math.max( y, viewerHeight - zoom.height ), 0 );
   return { left: x, top: y };
},
//结束
_end: function() {
   this._onend();
   this.onEnd();
   if ( this.autoHide ) { this._viewer.style.display = "none"; }
   this.stop();
   this.start();
},
//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() {
   this._ondispose();
   this.stop();
   if ( $$D.contains( this._viewer, this._zoom ) ) {
       this._viewer.removeChild( this._zoom );
   }
   this._image.onload = this._preload.onload =
       this._image = this._preload = this._zoom = this._viewer =
       this.onLoad = this.onStart = this.onMove = this.onEnd =
       this._START = this._MOVE = this._END = this._OUT = null
}
}
</script>
</head>
<body>
<style>
.container{ position:relative;}
.izImage, .izViewer{border:1px solid #000;background:#fff url('http://www.cnblogs.com/images/cnblogs_com/cloudgamer/169629/o_loading.gif') no-repeat center;}
.izImage{width:300px;cursor:crosshair;}
.izViewer{width:200px;height:200px;position:absolute;left:320px;top:0;display:none;}
.izViewer div{position:absolute;border:0 dashed #999;top:0;left:0;z-index:999;width:{bfb};height:{bfb};}
</style>
<div class="container"> <img id="idImage" class="izImage" src="http://www.cnblogs.com/images/cnblogs_com/cloudgamer/143727/o_vivian.jpg" />
   <div id="idViewer" class="izViewer">
       <div style="height:50%;border-bottom-width:1px;"></div>
       <div style="width:50%;border-right-width:1px;"></div>
   </div>
</div>
<br>
<input id="idStop" value="暂停" type="button">
<input id="idHide" value="取消隐藏" type="button">
<input id="idRange" value="指定范围" type="button">
<input id="idMouse" value="鼠标缩放" type="button">
<select id="idScale">
   <option value="0">按大图放大</option>
   <option value="2">放大2倍</option>
   <option value="5">放大5倍</option>
   <option value="10">放大10倍</option>
</select>
<br>
<br>
原图：
<input id="idChangeOrigin" type="text" size="40" value="http://www.cnblogs.com/images/cnblogs_com/cloudgamer/143727/o_mm_small.jpg">
<br>
大图：
<input id="idChangeZoom" type="text" size="40" value="http://www.cnblogs.com/images/cnblogs_com/cloudgamer/143727/o_mm_big.jpg">
<br>
<input id="idChange" value="换图" type="button">
<input id="idChangeReturn" value="还原" type="button">
<script>
var iz = new ImageZoom( "idImage", "idViewer", { onLoad: function(){ $$("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.cnblogs.com/images/cnblogs_com/cloudgamer/143727/o_vivian.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>

已投稿到：

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