网页特效小例子

来源：互联网发布：ubuntu 输入法安装编辑：程序博客网时间：2024/04/30 07:20
<span style="font-size:18px;"><!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><title>JavaScript图片放大技术代码示例及注释</title><style type="text/css">#magnifier{width:342px;height:420px;position:absolute;top:100px;left:250px;font-size:0;border:1px solid #000;}#img{width:342px;height:420px;}#Browser{border:1px solid #000;z-index:100;position:absolute;background:#555;}#mag{border:1px solid #000;overflow:hidden;z-index:100;}</style><script type="text/javascript">function getEventObject(W3CEvent) {//事件标准化函数return W3CEvent || window.event;}function getPointerPosition(e) {//兼容浏览器的鼠标x,y获得函数e = e || getEventObject(e);var x = e.pageX || (e.clientX + (document.documentElement.scrollLeft || document.body.scrollLeft));var y = e.pageY || (e.clientY + (document.documentElement.scrollTop || document.body.scrollTop));return { 'x':x,'y':y };}function setOpacity(elem,level) {//兼容浏览器设置透明值if(elem.filters) {elem.style.filter = 'alpha(opacity=' + level * 100 + ')';} else {elem.style.opacity = level;}}function css(elem,prop) {//css设置函数,可以方便设置css值,并且兼容设置透明值for(var i in prop) {if(i == 'opacity') {setOpacity(elem,prop[i]);} else {elem.style[i] = prop[i];}}return elem;}var magnifier = {m : null,init:function(magni){var m = this.m = magni || {cont : null,//装载原始图像的divimg : null,//放大的图像mag : null,//放大框scale : 15//比例值,设置的值越大放大越大,但是这里有个问题就是如果不可以整除时,会产生些很小的白边,目前不知道如何解决}css(m.img,{'position' : 'absolute','width' : (m.cont.clientWidth * m.scale) + 'px',//原始图像的宽*比例值'height' : (m.cont.clientHeight * m.scale) + 'px'//原始图像的高*比例值})css(m.mag,{'display' : 'none','width' : m.cont.clientWidth + 'px',//m.cont为原始图像,与原始图像等宽'height' : m.cont.clientHeight + 'px','position' : 'absolute','left' : m.cont.offsetLeft + m.cont.offsetWidth + 10 + 'px',//放大框的位置为原始图像的右方远10px'top' : m.cont.offsetTop + 'px'})var borderWid = m.cont.getElementsByTagName('div')[0].offsetWidth - m.cont.getElementsByTagName('div')[0].clientWidth;//获取border的宽css(m.cont.getElementsByTagName('div')[0],{//m.cont.getElementsByTagName('div')[0]为浏览框'display' : 'none',//开始设置为不可见'width' : m.cont.clientWidth / m.scale - borderWid + 'px',//原始图片的宽/比例值 - border的宽度'height' : m.cont.clientHeight / m.scale - borderWid + 'px',//原始图片的高/比例值 - border的宽度'opacity' : 0.5//设置透明度})m.img.src = m.cont.getElementsByTagName('img')[0].src;//让原始图像的src值给予放大图像m.cont.style.cursor = 'crosshair';m.cont.onmouseover = magnifier.start;},start:function(e){if(document.all){//只在IE下执行,主要避免IE6的select无法覆盖magnifier.createIframe(magnifier.m.img);}this.onmousemove = magnifier.move;//this指向m.contthis.onmouseout = magnifier.end;},move:function(e){var pos = getPointerPosition(e);//事件标准化this.getElementsByTagName('div')[0].style.display = '';css(this.getElementsByTagName('div')[0],{'top' : Math.min(Math.max(pos.y - this.offsetTop - parseInt(this.getElementsByTagName('div')[0].style.height) / 2,0),this.clientHeight - this.getElementsByTagName('div')[0].offsetHeight) + 'px','left' : Math.min(Math.max(pos.x - this.offsetLeft - parseInt(this.getElementsByTagName('div')[0].style.width) / 2,0),this.clientWidth - this.getElementsByTagName('div')[0].offsetWidth) + 'px'//left=鼠标x - this.offsetLeft - 浏览框宽/2,Math.max和Math.min让浏览框不会超出图像})magnifier.m.mag.style.display = '';css(magnifier.m.img,{'top' : - (parseInt(this.getElementsByTagName('div')[0].style.top) * magnifier.m.scale) + 'px','left' : - (parseInt(this.getElementsByTagName('div')[0].style.left) * magnifier.m.scale) + 'px'})},end:function(e){this.getElementsByTagName('div')[0].style.display = 'none';magnifier.removeIframe(magnifier.m.img);//销毁iframemagnifier.m.mag.style.display = 'none';},createIframe:function(elem){var layer = document.createElement('iframe');layer.tabIndex = '-1';layer.src = 'javascript:false;';elem.parentNode.appendChild(layer);layer.style.width = elem.offsetWidth + 'px';layer.style.height = elem.offsetHeight + 'px';},removeIframe:function(elem){var layers = elem.parentNode.getElementsByTagName('iframe');while(layers.length >0){layers[0].parentNode.removeChild(layers[0]);}}}window.onload = function(){magnifier.init({   cont : document.getElementById('magnifier'),   img : document.getElementById('magnifierImg'),   mag : document.getElementById('mag'),   scale : 3   });}</script></head><body><div id="magnifier"><img src="wall6.jpg" id="img" /><div id="Browser"></div></div><div id="mag"><img id="magnifierImg" /></div><select style="position:absolute;top:200px;left:650px;width:100px;"><option>select测试</option><option>是否能覆盖</option></select></body></html></span>
源图片：
效果如下：
1 0