console 命令行工具 X clear

console

var info=document.querySelector(".info");
var seats=document.querySelectorAll("li");
var movie=document.querySelector("select");
b=10;
movie.onchange=function() {
    b=movie.options[movie.selectedIndex].value;
    info.innerHTML="您选择了"+j+"个座位，价格为"+j*b+"元";
}
var j=0;

for (i=0;i<seats.length;i++) {
    seats[i].index=true;
    seats[i].addEventListener("click",function() {
            
        console.log(this.index)
        if (this.index){
            this.style.backgroundColor="lightblue";
            this.index=!this.index;
            j++;
            info.innerHTML="您选择了"+j+"个座位，价格为"+j*b+"元";
        }
        else {
            this.style.backgroundColor="#666";
            this.index=!this.index;
            j--;
            info.innerHTML="您选择了"+j+"个座位，价格为"+j*b+"元";
        }
       
    })
}
console.log(j);

<body>
    <div class="header">
        请选择一部电影：
        <select>
            <option value="10">变形金刚 10￥</option>
            <option value="11">泰坦尼克号 11￥</option>
            <option value="12">星际穿越 12￥</option>
            <option value="9">蝙蝠侠 9￥</option>
        </select>
    </div>
    <div class="tip">
        <div class="one"><div class="unfit"></div>可选</div>
        <div class="two"><div class="chose"></div>已选择</div>
        <div class="three"><div class="chosed"></div>已占位</div>
    </div>
    <div class="screen"></div>
    <div class="tra"></div>    
    <div class="seat">
        <div class="left">
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
        </div>
        <div class="middle">
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
        </div>
        <div class="right">
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
        </div>
    </div>
    <div class="info"></div>
</body>

body {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    background-color: rgb(32, 28, 51);
    color: white;
}
.tip {
    margin-top: 20px;
    width: 200px;
    height: 30px;
    background-color: #999;
    border-radius: 5px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 10px;
    color: white;
    padding: 3px;
}
.unfit {
    display: inline-block;
    height: 20px;
    width: 20px;
    background-color: #ccc;
    border-radius: 10px 10px 0 0;
        margin: 2px;
    vertical-align: bottom;
}
.chose {
    display: inline-block;
    height: 20px;
    width: 20px;
    background-color: lightblue;
    border-radius: 10px 10px 0 0;
        margin: 2px;
    vertical-align: bottom;
}
.chosed {
    display: inline-block;
    height: 20px;
    width: 20px;
    background-color: white;
    border-radius: 10px 10px 0 0;
    margin: 2px;
    vertical-align: bottom;
}
.one .two .three{
    width: 50px;
    height: 30px;
    background-color: khaki;
    vertical-align: center;
}
.screen {
    margin: 10px;
    width: 150px;
    border-top: 50px solid white;
    border-left: 20px solid transparent;
    /* border-bottom: 1px solid black; */
    border-right: 20px solid transparent;
    box-shadow: 0 0 8px 5px rgba(255, 255, 255, 0.507);
}
.seat {
    width: 200px;
    height: 100px;

    padding: 2px;
}
.left {
    float: left;
    width: 40px;
    height: 100px;

    margin-right: 10px;

}
.middle {
    width: 100px;
    height: 100px;

    margin-right: 10px;
    float: left;
}
.right {
    width: 40px;
    height: 100px;

    float: left;
}
.seat li{
    float: left;
    display: inline-block;
    height: 15px;
    width: 15px;
    background-color: #666;
    border-radius: 10px 10px 0 0;
    margin: 2px;
}
.left li:nth-child(2) {
    background-color: white;
}
.middle li:nth-child(10) {
    background-color: white;
}
.middle li:nth-child(14) {
    background-color: white;
}
.seat li:hover {
    transform: scale(1.2);
}