操作元素定位元素,用js来实现是个不错的选择,下面有个示例,需要的朋友可以看看
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<!DOCTYPE html>
< html >
< head >
< meta http-equiv = "Content-Type" content = "text/html; charset=UTF-8" />
< title >每天一个JavaScript实例-操作元素定位元素</ title >
< style >
div#a{
width:500px;
}
div{
border:1px solid #000;
padding:10px;
}
#cursor{
position:absolute;
background-color:#ff0;
width:20px;
height:20px;
left:50px;
top:300px;
}
</ style >
< script >
function positionObject(obj){
var rect = obj.getBoundingClientRect();
return [rect.left,rect.top];
}
window.onload = function(){
var tst = document.documentElement.getBoundingClientRect();
alert(tst.top);
var cont = 'A';
var cursor = document.getElementById("cursor");
while(cont){
cont = prompt("where do you want to move the cursor block?","A");
if(cont){
cont = cont.toLowerCase();
if(cont == "a"||cont=="b"||cont=="c"){
var elem = document.getElementById(cont);
var pos = positionObject(elem);
console.log(pos);
cursor.setAttribute("style","top:"+pos[1]+"px;"+"left:"+pos[0]+"px");
}
}
}
}
</ script >
</ head >
< body >
< div id = "a" >
< p >A</ p >
< div id = "b" >
< p >B</ p >
< div id = "c" >
< p >C</ p >
</ div >
</ div >
</ div >
< div id = "cursor" >
</ div >
</ body >
</ html >
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