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標籤：utf-8 load text 按鈕 back java head 名稱 har
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
#box{
width: 100px;
height: 100px;
background: #f00;
}
</style>
<script>
window.onload=function(){
var text1=document.getElementById(‘text1‘);
var text2=document.getElementById(‘text2‘);
var btn=document.getElementById(‘btn‘);
var box=document.getElementById(‘box‘);
btn.onclick=function(){
var name=text1.value;
var val=text2.value;
//console.log(name,val);
/**
* 點操作屬性的時候，後面只能跟真正的屬性名稱，不能跟變數名
* []操作屬性的時候，裡面可以放屬性名稱與變數名，如果放的屬性
* 名，那要加引號，如果放的是變數名，那不需要加引號
*/
box.style[name]=val;
};
};
</script>
</head>
<body>
<input type="text" id="text1" value=""/>
<input type="text" id="text2" value=""/>
<input type="button" id="btn" value="按鈕"/>
<div id="box"></div>
</body>
</html>
javascript 操作屬性和變數
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