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js实现图片放大预览效果
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<!--
*** 斩梦人.天天 [原创]分享
*** QQ:22062019 Email:takuma888@126.com
***
*** 欢迎大家引用和改进,但希望大家能珍惜作者的劳动,最好能注明出处.
*** 由于浏览器兼容性的问题,在FF和OP下表现不是很理想,没能完善,还请见谅.
//-->
<script language="JavaScript">
<!--
var srcX = 1024; //原图长宽
var srcY = 768;
var bigX = 500; //原比例预览大小,可以设置成任意大小
var bigY = 300;
var smallX = 256; //缩略图大小,要与原大小成比例
var smallY = 192;
var viewX = bigX / srcX * smallX; //预览范围
var viewY = bigY / srcY * smallY;
var bl = srcX / smallX;//缩小比例
var border = 8; //边框
window.onload=function (){
bigbox.style.borderWidth=border;
bigbox.style.width=bigX+border*2;
bigbox.style.height=bigY+border*2;
smallpic.width=smallX;
smallpic.height=smallY;
view.style.width=viewX;
view.style.height=viewY;
smallbox.style.borderWidth=border;
if (window.event){
smallbox.style.width=smallpic.offsetWidth+border*2;
smallbox.style.height=smallpic.offsetHeight+border*2;
}else{
smallbox.style.width=smallpic.offsetWidth;
smallbox.style.height=smallpic.offsetHeight;
}
move(event);
}
function move(e){
var e = window.event?window.event:e;
var iebug = 0;
if (window.event){
var vX = e.offsetX - viewX/2;
var vY = e.offsetY - viewY/2;
}else{
var vX = e.pageX - viewX/2 - smallbox.offsetLeft - border;
var vY = e.pageY - viewY/2 - smallbox.offsetTop - border;
iebug = 2;
}
if (vX < 0) vX = 0;
if (vY < 0) vY = 0;
if (vX > smallX - viewX - iebug) vX = smallX - viewX - iebug;
if (vY > smallY - viewY - iebug) vY = smallY - viewY - iebug;
view.style.left = vX + smallbox.offsetLeft + border;
view.style.top = vY + smallbox.offsetTop + border;
bigpico.style.marginLeft = - vX * bl
bigpico.style.marginTop = - vY * bl
}
//-->
</script>
<style type="text/css">
<!--
*{padding:0;margin:0}
img{display:block;}
#smallbox{border:1px #c33 solid;float:left;width:0;height:0;overflow:hidden}
#bigbox{border:1px #c33 solid;width:0px;height:0px;float:left;overflow:hidden}
#view{border:1px #ddd solid;width:0px;height:0px;position:absolute}
.head{text-align:center;line-height:40px;font:bold 16px/40px;color:red}
//-->
</style>
<div class="head">图片放大预览效果演示,交流地址：<a href="http://bbs.okajax.com/thread-6271-1-1.html" target="_self">Ajax技术论坛</a></div>
<div id="smallbox"><img id="smallpic" src="http://bbs.okajax.com/demo/32/pic.jpg" border="0" onmousemove="move(event)"></div>
<div id="bigbox"><div id="bigpico"><img id="bigpic" src="http://bbs.okajax.com/demo/32/pic.jpg" border="0"></div></div>
<div id="view"></div>
*** 斩梦人.天天 [原创]分享
*** QQ:22062019 Email:takuma888@126.com
***
*** 欢迎大家引用和改进,但希望大家能珍惜作者的劳动,最好能注明出处.
*** 由于浏览器兼容性的问题,在FF和OP下表现不是很理想,没能完善,还请见谅.
//-->
<script language="JavaScript">
<!--
var srcX = 1024; //原图长宽
var srcY = 768;
var bigX = 500; //原比例预览大小,可以设置成任意大小
var bigY = 300;
var smallX = 256; //缩略图大小,要与原大小成比例
var smallY = 192;
var viewX = bigX / srcX * smallX; //预览范围
var viewY = bigY / srcY * smallY;
var bl = srcX / smallX;//缩小比例
var border = 8; //边框
window.onload=function (){
bigbox.style.borderWidth=border;
bigbox.style.width=bigX+border*2;
bigbox.style.height=bigY+border*2;
smallpic.width=smallX;
smallpic.height=smallY;
view.style.width=viewX;
view.style.height=viewY;
smallbox.style.borderWidth=border;
if (window.event){
smallbox.style.width=smallpic.offsetWidth+border*2;
smallbox.style.height=smallpic.offsetHeight+border*2;
}else{
smallbox.style.width=smallpic.offsetWidth;
smallbox.style.height=smallpic.offsetHeight;
}
move(event);
}
function move(e){
var e = window.event?window.event:e;
var iebug = 0;
if (window.event){
var vX = e.offsetX - viewX/2;
var vY = e.offsetY - viewY/2;
}else{
var vX = e.pageX - viewX/2 - smallbox.offsetLeft - border;
var vY = e.pageY - viewY/2 - smallbox.offsetTop - border;
iebug = 2;
}
if (vX < 0) vX = 0;
if (vY < 0) vY = 0;
if (vX > smallX - viewX - iebug) vX = smallX - viewX - iebug;
if (vY > smallY - viewY - iebug) vY = smallY - viewY - iebug;
view.style.left = vX + smallbox.offsetLeft + border;
view.style.top = vY + smallbox.offsetTop + border;
bigpico.style.marginLeft = - vX * bl
bigpico.style.marginTop = - vY * bl
}
//-->
</script>
<style type="text/css">
<!--
*{padding:0;margin:0}
img{display:block;}
#smallbox{border:1px #c33 solid;float:left;width:0;height:0;overflow:hidden}
#bigbox{border:1px #c33 solid;width:0px;height:0px;float:left;overflow:hidden}
#view{border:1px #ddd solid;width:0px;height:0px;position:absolute}
.head{text-align:center;line-height:40px;font:bold 16px/40px;color:red}
//-->
</style>
<div class="head">图片放大预览效果演示,交流地址：<a href="http://bbs.okajax.com/thread-6271-1-1.html" target="_self">Ajax技术论坛</a></div>
<div id="smallbox"><img id="smallpic" src="http://bbs.okajax.com/demo/32/pic.jpg" border="0" onmousemove="move(event)"></div>
<div id="bigbox"><div id="bigpico"><img id="bigpic" src="http://bbs.okajax.com/demo/32/pic.jpg" border="0"></div></div>
<div id="view"></div>