用JavaScript写一个九宫格的抽奖盘，供大家参考，具体内容如下
点击中间的块，选中奖品的亮块会在边缘的8个块循环；
选中后，弹出选中的内容；
代码参考：
HTML文件:
<body> <div class="box"> <ul id="jiangPin"> <li><a href="javascript:viod(0);" ><span>奖品 1</span></a></li> <li><a href="javascript:viod(0);" ><span>奖品 2</span></a></li> <li><a href="javascript:viod(0);" ><span>奖品 3</span></a></li> <li><a href="javascript:viod(0);" ><span>奖品 4</span></a></li> <li><a href="javascript:viod(0);" ><span>奖品 5</span></a></li> <li><a href="javascript:viod(0);" ><span>奖品 6</span></a></li> <li><a href="javascript:viod(0);" ><span>奖品 7</span></a></li> <li><a href="javascript:viod(0);" ><span>奖品 8</span></a></li> </ul> <button type="button" class="btn" id="beginBtn">点击开始</button> <div class="tishi" id="tishi"> <span>恭喜您获得：</span> <p></p> <button>确定</button> </div> </div> </body>
通过position定位来固定奖盘各个板块的位置，将有奖品的8个块分散在九宫格的边缘，开始按钮在九宫格正中间，将弹出的提示框放于整个奖盘的上层显示，初始将其隐藏。
CSS文件：
.box{
width: 450px;
height: 450px;
background-color: #9a6e3a;
border: 2px solid #990055;
position: relative;
z-index: 10;
}
.box>ul>li{
position: absolute;
width: 148px;
height: 148px;
border: 1px #222222 solid;
background-color: #ad889d;
}
.box>ul>li>a{
display: block;
color: #fff;
font-size: 30px;
text-align: center;
line-height: 148px;
}
/* 开始按钮 */
.btn{
position: absolute;
top: 150px;
left: 150px;
width: 150px;
height: 150px;
border: 1px #222222 solid;
background-color: #7d53c7;
outline: none;
cursor: pointer;
color: #fff;
font-size: 25px;
transition: all 0.5s;
z-index: 20;
}
.btn:hover{
background-color: #df04ff;
font-size: 30px;
}
.btn:active{
background-color: #7d53c7;
}
.box>ul>li.on{
background-color: #f00;
}
/* 开始按钮 end */
/* 奖品定位 */
.box>ul>li:nth-child(1){
top: 0;
left: 0;
}
.box>ul>li:nth-child(2){
top: 0;
left: 150px;
}
.box>ul>li:nth-child(3){
top: 0;
left: 300px;
}
.box>ul>li:nth-child(4){
top: 150px;
left: 300px;
}
.box>ul>li:nth-child(5){
top: 300px;
left: 300px;
}
.box>ul>li:nth-child(6){
top: 300px;
left: 150px;
}
.box>ul>li:nth-child(7){
top: 300px;
left: 0;
}
.box>ul>li:nth-child(8){
top: 150px;
left: 0;
}
/* 奖品定位 end */
/* 提示框 */
.tishi{
width: 300px;
height: 146px;
border: 2px #990055 solid;
background: #92EC1F;
border-radius: 20px;
position: absolute;
left: 50%;
top: 50%;
margin-top: -75px;
margin-left: -150px;
z-index: 30;
text-align: center;
font-size: 25px;
font-weight: bold;
display: none;
animation: tishiAni 0.5s both;
transition: all 0.5s;
}
.tishi>p{
color: red;
font-size: 28px;
margin-top: 20px;
}
.tishi>button{
width: 60px;
height: 30px;
border:none;
outline: none;
cursor: pointer;
position: absolute;
right: 30px;
bottom: 20px;
}
@keyframes tishiAni {
0%{
opacity: 0;
}
100%{
opacity: 1;
}
}
/* 提示框 end */通过计时器来实现奖品亮块的循环
JavaScript文件：
{
let jiangPinChi = [
"奖品1",
"奖品2",
"奖品3",
"奖品4",
"奖品5",
"奖品6",
"奖品7",
"奖品8",
];
let index = 0;
let times = Math.round( Math.random()*20 ) 20 ;
let jiangPin = document.getElementById("jiangPin");
let beginBtn = document.getElementById("beginBtn");
let tishi = document.getElementById("tishi");
let cont = tishi.children;
let jPLi = jiangPin.children;
let liBro = function (tag) {
let fat = tag.parentNode;
let tagLi = fat.children;
let othLis = [];
for (let jPLi of tagLi) {
if (jPLi === tag) {
continue;
}
othLis.push(jPLi);
}
return othLis;
};
let showing = function( index ) {
let othLis = liBro( jPLi[index] );
for( let i = 0; i<=othLis.length-1 ; i ){
othLis[i].classList.remove("on");
}
// othLis.forEach(function( value,i ){
// value.classList.remove("on");
// });
jPLi[index].classList.add("on");
};
let changeFun = function( event ){
let myset = setInterval(function(){
index ;
times--;
if( index > jPLi.length-1 ){
index = 0;
}
showing( index );
if( times <= 0 ){
clearInterval(myset);
times = Math.round( Math.random()*20 ) 20;
tishi.style.display = "block";
cont[1].innerHTML = jiangPinChi[index];
}
},100);
};
beginBtn.addEventListener("click",changeFun);
cont[2].addEventListener("click",function( event ){
tishi.style.display = "none";
});
}当然，这个可以扩展成更多的类型，实现不止九宫格的奖盘抽奖模式。
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