Rumah > Artikel > hujung hadapan web > 如何实现淘宝放大镜实例
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function getByClass(oParent,sClass){ var aEle=oParent.getElementsByTagName('*'); var aTmp=[]; var i=0; for(i=0;i<aEle.length;i++){ if(aEle[i].className==sClass){ aTmp.push(aEle[i]); } } return aTmp; } var op = document.getElementById('p1'); var oMark = getByClass(op,'mark')[0]; var oFloat=getByClass(op,'float_layer')[0]; var oBg=getByClass(op,'big_pic')[0]; var oSm=getByClass(op,'small_pic')[0]; var oImg=oBg.getElementsByTagName('img')[0]; oMark.onmouseover=function(){ oFloat.style.display='block'; oBg.style.display='block'; } oMark.onmouseout=function(){ oFloat.style.display='none'; oBg.style.display='none'; } oMark.onmousemove=function(ev){ var oEvent=ev||event; var disX=oEvent.clientX-op.offsetLeft-oSm.offsetLeft-oFloat.offsetWidth/2; var disY=oEvent.clientY-op.offsetTop-oSm.offsetTop-oFloat.offsetHeight/2; var l=disX, t=disY; l<0?l=0:l>(oMark.offsetWidth-oFloat.offsetWidth)?l=oMark.offsetWidth-oFloat.offsetWidth:l=disX; t<0?t=0:t>(oMark.offsetWidth-oFloat.offsetHeight)?t=oMark.offsetWidth-oFloat.offsetHeight:t=disY; // if(l<0){ // l=0; // }else if(l>oMark.offsetWidth-oFloat.offsetWidth){ // l=oMark.offsetWidth-oFloat.offsetWidth; // } // if(t<0){ // t=0; // }else if(t>oMark.offsetWidth-oFloat.offsetHeight){ // t=oMark.offsetWidth-oFloat.offsetHeight; // } oFloat.style.left=l+'px'; oFloat.style.top=t+'px'; var percentX=l/(oMark.offsetWidth-oFloat.offsetWidth); var percentY=t/(oMark.offsetHeight-oFloat.offsetHeight); oImg.style.left=-(oImg.offsetWidth-oBg.offsetWidth)*percentX +'px'; oImg.style.top=-(oImg.offsetHeight-oBg.offsetHeight)*percentY +'px'; }
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