<style>
#img{position:absolute;height:200px;width:200px;left:200px;top:200px;}
</style>
<BODY>
<img src="" id="img">
<script>
var isDrag = false;
var startX;
img.onmousedown = function(){isDrag =true; startX=event.x;}
document.onmouseup = img.onmouseup = function(){isDrag =false;}
document.onmousemove =img.onmousemove =function(){
if(isDrag){
if(event.x > startX && img.offsetLeft>500) return;
if(event.x < startX && img.offsetLeft<100) return; img.style.left = img.offsetLeft + (event.x-startX);
startX = event.x;
}
}
</script>
</BODY>一个简单点的 左右范围100-500
#img{position:absolute;height:200px;width:200px;left:200px;top:200px;}
</style>
<BODY>
<img src="" id="img">
<script>
var isDrag = false;
var start = [];
img.onmousedown = function(){isDrag =true; start=[event.x,event.y];}
document.onmouseup = img.onmouseup = function(){isDrag =false;}
document.onmousemove =img.onmousemove =function(){
if(isDrag){
if(event.x > start[0] && img.offsetLeft>500) return;
if(event.x < start[0] && img.offsetLeft<100) return; img.style.left = img.offsetLeft + (event.x-start[0]);
img.style.top = img.offsetTop + (event.y-start[1]);
start=[event.x,event.y];
}
}
</script>
</BODY>
#img{position:absolute;height:200px;width:200px;left:200px;top:200px;}
</style>
<BODY>
<img src="" id="img">
<script>
var isDrag = false;
var startX;
img.onmousedown = function(){isDrag =true; startX=event.x;}
document.onmouseup = img.onmouseup = function(){isDrag =false;}
document.onmousemove =img.onmousemove =function(){
if(isDrag){
if(event.x > startX && img.offsetLeft>500) return;
if(event.x < startX && img.offsetLeft<100) return; img.style.left = img.offsetLeft + (event.x-startX);
startX = event.x;
}
} document.onclick=function(){
if(event.srcElement == img) return;
if(event.x < 100){
img.style.left = 100;
}else if(event.x > 500){
img.style.left = 500;
}else{
img.style.left = event.x;
}
}
</script>
</BODY>
另一个div(如参考的)放里面设置好位置并设置好左右移动的范围
偶就不做了