4.字符串模板

1.作用：简化字符串的拼接；
2.使用：
     *将拼接的字符串内容必须放在` `里面
     *字符串中需要变化的部分，放在${ xxx }中。

作用:可以在字符串中使用变量

var str = "hello";
var age = 18;
console.log('world'+str);
/*
    ``  字符串模板 可以在字符串中插入变量${}
*/
var sum = `world${str}`;
console.log(sum);

应用示例:

    <!-- <div>
        <p>name</p>
        <p>age</p>
    </div>
    <div>
        <p>name</p>
        <p>age</p>
    </div> -->
    <script>
        var arr = [
            {
                imgUrl: 'img/1.jpg',
                name: 'cheng',
                age: 18
            },
            {
                imgUrl: 'img/2.jpg',
                name: 'lis',
                age: 18
            }
        ]
        for (var i = 0; i < arr.length; i++) {
            var { imgUrl, name, age } = arr[i];
            var template = `
                <div>
                    <p>${name}</p>
                    <p>${age}</p>
                    <img src='${imgUrl}'>
                </div>    
            `
            $('body').prepend(template)
        }
    </script>

4-1 ajxa网易云实例

*{
    margin: 0;
    padding: 0;
}
.container{
    width: 1000px;
    border: 1px solid #333;
    padding: 20px;
    margin-left: auto;
    margin-right: auto;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}
.container .item{
    padding: 5px;
    width: 140px;
  border: 1px solid #333;
  overflow: hidden;
  border-radius: 10%;
}
.item img{
    width: 100%;
}
.item{
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
}
.size{
    width: 100%;
    font-size: 12px;
    color: #666;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
}
.font{
    font-size: 14px;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
}
.bj{
   position: absolute;
    bottom: 40px;
    width: 100%;
    height: 27px;
    background-image: url(../images/coverall.png);
    background-position: 0 -537px;
    color: #ccc;
    font-size: 12px;
    line-height: 27px;
}
#dw{
    position: absolute;
    font-size: 25px;
    right: 10px;
} 
    <div class="container">
       <div class="item">
  <img src="" alt="">
 <p></p> 
 <p></p>   
 <p><span></span> <span></span></p> 
</div>
<script>
 var url="http://47.108.197.28:3000/top/playlist?limit=";
    $.ajax({
        url,
        success:res=>{
          var playlists= res.playlists;
          for(var i=0;i<playlists.length;i++){
            var {coverImgUrl,name,creator,playCount}=playlists[i];
            var nickname=creator.nickname
            var count=Math.round(playCount/10000)+"万"; 
           console.log(count);
             var temp=`           
             <div class="item">
             <img src="${coverImgUrl}" />
             <p class="bj">${count}<span class="iconfont">&#xea10;</span><span class="iconfont" id="dw">&#xe66d;</span></p>
             <p class="font">${name}</p>
             <p class="size"><span>by</span> ${nickname}</p>
            </div>
             `   
             $(".container").prepend(temp);    
          } 
        }
    })