本文提供了一个简单的帧同步滚动Demo，通过JavaScript实现两个iframe内的滚动条同步滚动效果，并提供了开启和关闭同步的功能。
应网友要求，写了一个frame同步滚动的DEMO，很简单，收录在这里：
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
body {
font-size:9pt;
color:#333333;
}
iframe {
position:absolute;
width:200px;
height:400px;
margin:20px;
border:1px solid #FF6600;
}
#ifr1 {
left:20px;
top:20px;
}
#ifr2 {
left:320px;
top:20px;
}
</style>
<script type="text/javascript">
function FrameHelper(ifr1,ifr2){
this.ifr1 = ifr1;
this.ifr2 = ifr2;
this.syncable = true;
this.bindEvent();
}
FrameHelper.prototype = {
sync:function(activeFrame){
if(!this.syncable)return;
var passiveFrame = (activeFrame == this.ifr1) ? this.ifr2 : this.ifr1;
if(activeFrame.document.documentElement){
passiveFrame.document.documentElement.scrollTop = activeFrame.document.documentElement.scrollTop;
passiveFrame.document.documentElement.scrollLeft = activeFrame.document.documentElement.scrollLeft;
}else{
passiveFrame.document.body.scrollTop = activeFrame.document.body.scrollTop;
passiveFrame.document.body.scrollLeft = activeFrame.document.body.scrollLeft;
}
},
bindEvent:function(){
var _this = this;
if(document.all){
this.ifr1.attachEvent("onscroll",function(){_this.sync(_this.ifr1);});
this.ifr2.attachEvent("onscroll",function(){_this.sync(_this.ifr2);});
}else{
this.ifr1.addEventListener("scroll",function(){_this.sync(_this.ifr1);},false);
this.ifr2.addEventListener("scroll",function(){_this.sync(_this.ifr2);},false);
}
},
syncModeOn:function(){
this.syncable = true;
},
syncModeOff:function(){
this.syncable = false;
}
}
window.onload = function(){
var fh = new FrameHelper(document.getElementById("ifr1").contentWindow,document.getElementById("ifr2").contentWindow);
document.getElementById("toggle").onchange = function(){
(!!this.checked)?fh.syncModeOn():fh.syncModeOff();
}
}
</script>
</head>
<body>
<iframe id="ifr1" src="s.html"></iframe>
<iframe id="ifr2" src="s.html"></iframe>
<input type="checkbox" id="toggle" checked="checked"/>是否同步滚动
</body>
</html>
<!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><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title></title><style type="text/css">
body {
body font-size:9pt; color:#333333; } iframe { position:absolute; width:200px; height:400px; margin:20px; border:1px solid #FF6600; } #ifr1 { left:20px; top:20px; } #ifr2 { left:320px; top:20px; }</style><script type="text/javascript"> function FrameHelper(ifr1,ifr2){ this.ifr1 = ifr1; this.ifr2 = ifr2; this.syncable = true; this.bindEvent(); } FrameHelper.prototype = { sync:function(activeFrame){ if(!this.syncable)return; var passiveFrame = (activeFrame == this.ifr1) ? this.ifr2 : this.ifr1; if(activeFrame.document.documentElement){ passiveFrame.document.documentElement.scrollTop = activeFrame.document.documentElement.scrollTop; passiveFrame.document.documentElement.scrollLeft = activeFrame.document.documentElement.scrollLeft; }else{ passiveFrame.document.body.scrollTop = activeFrame.document.body.scrollTop; passiveFrame.document.body.scrollLeft = activeFrame.document.body.scrollLeft; } }, bindEvent:function(){ var _this = this; if(document.all){ this.ifr1.attachEvent("onscroll",function(){_this.sync(_this.ifr1);}); this.ifr2.attachEvent("onscroll",function(){_this.sync(_this.ifr2);}); }else{ this.ifr1.addEventListener("scroll",function(){_this.sync(_this.ifr1);},false); this.ifr2.addEventListener("scroll",function(){_this.sync(_this.ifr2);},false); } }, syncModeOn:function(){ this.syncable = true; }, syncModeOff:function(){ this.syncable = false; } } window.onload = function(){ var fh = new FrameHelper(document.getElementById("ifr1").contentWindow,document.getElementById("ifr2").contentWindow); document.getElementById("toggle").onchange = function(){ (!!this.checked)?fh.syncModeOn():fh.syncModeOff(); } }</script></head><body><iframe id="ifr1" src="s.html"></iframe><iframe id="ifr2" src="s.html"></iframe><input type="checkbox" id="toggle" checked="checked"/>是否同步滚动</body></html>
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