要完成此效果需要两个步骤
第一步：把如下代码加入到<head>区域中
<SCRIPT LANGUAGE="JavaScript">
<!--
color=new Array("0","3","6","9","C","F");
speed=250;
document.bgColor="FFFFFF";
bg=new Array("FFFFFF","FFFFFF","FFFFFF");
function begin() {
document.form.col1.value=" X "; document.form.col2.value=" X ";
document.form.col3.value=" X "; i=0; roll(speed);
}
function roll(speedB) //轮子滚动
{
if (document.form.col1.value==" X ") {
document.form.c1.value=document.form.b1.value;
document.form.b1.value=document.form.a1.value;
document.form.a1.value=
color[Math.round(Math.random()*10)%6]+
color[Math.round(Math.random()*10)%6]; //利用随机函数产生轮子上的颜色值
}
if (document.form.col2.value==" X ") {
document.form.c2.value=document.form.b2.value;
document.form.b2.value=document.form.a2.value;
document.form.a2.value=
color[Math.round(Math.random()*10)%6]+
color[Math.round(Math.random()*10)%6];
}
if (document.form.col3.value==" X ") {
document.form.c3.value=document.form.b3.value;
document.form.b3.value=document.form.a3.value;
document.form.a3.value=
color[Math.round(Math.random()*10)%6]+
color[Math.round(Math.random()*10)%6];
}
setTimeout("roll("+speedB+")",speedB);
}
function stop(col) //轮子停止滚动
{
if (col==1) {document.form.col1.value=" ";i++;}
if (col==2) {document.form.col2.value=" ";i++;}
if (col==3) {document.form.col3.value=" ";i++;}
if (i==3) {
bg[0]=document.form.a1.value+
document.form.a2.value+
document.form.a3.value;
bg[1]=document.form.b1.value+
document.form.b2.value+
document.form.b3.value;
bg[2]=document.form.c1.value+
document.form.c2.value+
document.form.c3.value;
speedB=500000;roll(speedB);
}
}
function view(letter) //颜色预览
{
document.bgColor=bg[letter];
document.form.color.value="#"+bg[letter];
}
-->
</script>
第二步：把如下代码加入到<body>区域中
<form name="form">
<table cellpadding=2 border=1 align="center">
<tr><td align=center>
<input type=text name="a1" size=3 onFocus="this.blur()" value=" ">
<input type=text name="a2" size=3 onFocus="this.blur()" value=" ">
<input type=text name="a3" size=3 onFocus="this.blur()" value=" ">
<input type=button onClick="view(0)" value="预览"><br>
<input type=text name="b1" size=3 onFocus="this.blur()" value=" ">
<input type=text name="b2" size=3 onFocus="this.blur()" value=" ">
<input type=text name="b3" size=3 onFocus="this.blur()" value=" ">
<input type=button onClick="view(1)" value="预览"><br>
<input type=text name="c1" size=3 onFocus="this.blur()" value=" ">
<input type=text name="c2" size=3 onFocus="this.blur()" value=" ">
<input type=text name="c3" size=3 onFocus="this.blur()" value=" ">
<input type=button onClick="view(2)" value="预览"><br>
<input type=button onClick="stop(1)" value=" X " name="col1">
<input type=button onClick="stop(2)" value=" X " name="col2">
<input type=button onClick="stop(3)" value=" X " name="col3">
</td>
<td valign=middle align=center>
<input type=button onClick="begin()" value="启动!"><p>
<table bgcolor=FFFFFF border=1 cellspacing=0>
<tr><td align=center valign=middle>按"X" 轮子停止转动...<p>
BG Color = <input type=text size=7 value="#FFFFFF" name=color>
</td></tr>
</table>
</td></tr>
</table>
</form>
<p><center>
<table class=30pt>
<tr><td>颜色的随机产生
</tr><tr><td>按下启动按钮,右边的三排轮子开始滚动
</tr><tr><td>按下三个X按钮颜色值定下来
</tr><tr><td>按下预览按钮可看颜色效果
</tr>
</table>
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