<!DOCTYPE html>
<html>
<head>
<style>
#button{text-align:center;}
#outer{width:330px; height:100px; margin:10px auto;}
#outer div{float:left;width:100px;height:100px;margin:0px 5px;background:black;}
</style>
<script>
window.onload = function() {
var obutton = document.getElementsByTagName("button")[0];
var outer = document.getElementById("outer");
var outerDiv = outer.getElementsByTagName("div");
obutton.onclick = function() {
for(var p in outerDiv) outerDiv[p].style.background = "red";
};
};
</script>
</head>
<body>
<div id="button">
<button>點擊變紅色</button>
</div>
<div id="outer">
<div></div>
<div></div>
<div></div>
</div>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<style>
#button{text-align:center;}
#outer{width:330px; height:100px; margin:10px auto;}
#outer div{float:left;width:100px;height:100px;margin:0px 5px;background:black;}
</style>
<script>
window.onload = function() {
var obutton = document.getElementsByTagName("button")[0];
var outer = document.getElementById("outer");
var outerDiv = outer.getElementsByTagName("div");
obutton.onclick = function() {
for (var i = 0; i < outerDiv.length; i++){
outerDiv[i].style.background = "red";
}
};
};
</script>
</head>
<body>
<div id="button">
<button>點擊變紅色</button>
</div>
<div id="outer">
<div></div>
<div></div>
<div></div>
</div>
</body>
</html>
