一个JavaScript操作元素定位元素的实例

2024-05-06 16:10:10

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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

<!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>