本文實例講述了JS實現Fisheye效果動感放大菜單代碼。分享給大家供大家參考，具體如下：
這款Fisheye Menu，是采用JS+CSS+XHTML實現的動感放大菜單，放到圖標上的時候，圖標會被放大，整個菜單有緩沖彈簧的效果，學jQuery的朋友見的比較多，不過本款沒有用到jQuery，效果卻同樣精彩。
運行效果截圖如下：
在線演示地址如下：
http://demo.VeVB.COm/js/2015/js-fisheye-style-menu-demo/
具體代碼如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>Fisheye 動感放大的菜單</title><style>#fisheye_menu { list-style: none; padding: 0; margin: 10px; height: 81px;}#fisheye_menu li { position: relative; display: block; float: left;}#fisheye_menu span { position: absolute; top: 100%; left: 0; text-align: center; width: 79px; padding: 1px; margin: 0; border: solid 1px #bbb; color: #333; background: #eee;}#fisheye_menu a { text-decoration: none;}#fisheye_menu img { border: 0; vertical-align: top;}</style><script type='text/javascript'>var fisheyemenu = { startSize : 55, endSize : 88, imgType : ".gif", init : function () { var animElements = document.getElementById("fisheye_menu").getElementsByTagName("img"); var titleElements = document.getElementById("fisheye_menu").getElementsByTagName("span"); for(var j=0; j<titleElements.length; j++) { titleElements[j].style.display = 'none'; } for(var i=0; i<animElements.length; i++) { var y = animElements[i]; y.style.width = fisheyemenu.startSize+'px'; y.style.height = fisheyemenu.startSize+'px'; fisheyemenu.imgSmall(y); animElements[i].onmouseover = changeSize; animElements[i].onmouseout = restoreSize; } function changeSize() { fisheyemenu.imgLarge(this); var x = this.parentNode.getElementsByTagName("span"); x[0].style.display = 'block'; if (!this.currentWidth) this.currentWidth = fisheyemenu.startSize; fisheyemenu.resizeAnimation(this,this.currentWidth,fisheyemenu.endSize,15,10,0.333); } function restoreSize() { var x = this.parentNode.getElementsByTagName("span"); x[0].style.display = 'none'; if (!this.currentWidth) return; fisheyemenu.resizeAnimation(this,this.currentWidth,fisheyemenu.startSize,15,10,0.5); fisheyemenu.imgSmall(this); } }, resizeAnimation : function (elem,startWidth,endWidth,steps,intervals,powr) { if (elem.widthChangeMemInt) window.clearInterval(elem.widthChangeMemInt); var actStep = 0; elem.widthChangeMemInt = window.setInterval( function() { elem.currentWidth = fisheyemenu.easeInOut(startWidth,endWidth,steps,actStep,powr); elem.style.width = elem.currentWidth+"px"; elem.style.height = elem.currentWidth+"px"; actStep++; if (actStep > steps) window.clearInterval(elem.widthChangeMemInt); } ,intervals) }, easeInOut : function (minValue,maxValue,totalSteps,actualStep,powr) { var delta = maxValue - minValue; var stepp = minValue+(Math.pow(((1 / totalSteps)*actualStep),powr)*delta); return Math.ceil(stepp) }, imgSmall : function (obj) { imgSrc = obj.getAttribute("src"); var typePos = imgSrc.indexOf(fisheyemenu.imgType, 0); var imgName = imgSrc.substr(0, typePos); obj.setAttribute("src", imgName+"_small"+fisheyemenu.imgType); }, imgLarge : function (obj) { imgSrc = obj.getAttribute("src"); var typePos = imgSrc.indexOf("_small", 0); var imgName = imgSrc.substr(0, typePos); obj.setAttribute("src", imgName+fisheyemenu.imgType); }}if ( typeof window.addEventListener != "undefined" ) window.addEventListener( "load", fisheyemenu.init, false );else if ( typeof window.attachEvent != "undefined" ) window.attachEvent( "onload", fisheyemenu.init );else { if ( window.onload != null ) { var oldOnload = window.onload; window.onload = function ( e ) { oldOnload( e ); fisheyemenu.init(); }; } else window.onload = fisheyemenu.init;}</script> </head> <body> <div> <ul id="fisheye_menu"> <li><a href="#1"><img src="images/icon.gif" alt="武林網" /><span>Icon 1</span></a></li> <li><a href="#2"><img src="images/icon2.gif" alt="image description" /><span>Icon 2</span></a></li> <li><a href="#3"><img src="images/icon.gif" alt="腳本下載" /><span>Icon 3</span></a></li> <li><a href="#4"><img src="images/icon2.gif" alt="image description" /><span>Icon 4</span></a></li> <li><a href="#5"><img src="images/icon.gif" alt="VeVB.COm" /><span>Icon 5</span></a></li> <li><a href="#6"><img src="images/icon2.gif" alt="image description" /><span>Icon 6</span></a></li> </ul> </div> </body></html>希望本文所述對大家JavaScript程序設計有所幫助。
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