我是一個JavaScript初學者,你能告訴我下面的代碼有什麼問題嗎?顏色循環一個元素不工作?
我希望在按下按鈕時調用buttonPressed()
。從buttonPressed()
它應該叫changeColor1()
,changeColor1()
應改變段落的文本顏色,並啓動一個計時器來調用changeColor2()
。同樣,changeColor2()
也應該改變顏色,並在計時器到期後再調用changeColor1()
。
<html>
<head>
<script type="text/javascript">
function changeColor2()
{
alert("2");
var v = document.getElementById("onet");
v.style.color = rgb(0,255,255); // this statement is not working
var t=setTimeout(changeColor1,3000);
}
function changeColor1()
{
alert("1");
var v = document.getElementById("onet");
v.style.color = rgb(255,255,0); // this statement is not working
var t=setTimeout(changeColor2,3000);
}
function buttonPressed()
{
alert("Hello");
changeColor1();
}
</script>
</head>
<body>
<p id="onet"> Hello how are you? </p>
<form>
<input type="button" value="Display alert box!" onClick="buttonPressed()" />
</form>
</body>
</html>
代碼應該做什麼?它做什麼呢?這是功課嗎? – cdhowie 2010-11-23 18:35:01