在常用的flex布局中，当页面展示商品时，因为数据的不确定，导致justify-content设置成space-between，最后一行布局错乱
1 <!DOCTYPE html>
2 <html lang="en">
3 <head>
4 <meta charset="UTF-8">
5 <meta http-equiv="X-UA-Compatible" content="IE=edge">
6 <meta name="viewport" content="width=device-width, initial-scale=1.0">
7 <title>Document</title>
8 <style>
9 .box{
10 display: flex;
11 flex-direction: row;
12 justify-content: space-between;
13 flex-wrap: wrap;
14 align-content: flex-start;
15 width: 450px;
16 background-color: antiquewhite;
17 }
18 .box div{
19 width: 100px;
20 height: 100px;
21 text-align: center;
22 line-height: 100px;
23 font-size: 30px;
24 color: aliceblue;
25 }
26 .box .div1{
27 background-color: gold;
28 }
29 .div2{
30 background-color: blueviolet;
31 }
32 .div3{
33 background-color: blue;
34 }
35 .div4{
36 background-color: gray;
37 }
38 .div5{
39 background-color: green;
40 }
41 .div6{
42 background-color: red;
43 }
44 .div7{
45 background-color: aquamarine;
46 }
47 .div8{
48 background-color: rebeccapurple;
49 }
50 </style>
51 </head>
52 <body>
53 <div class="box">
54 <div class="div1">1</div>
55 <div class="div2">2</div>
56 <div class="div3">3</div>
57 <div class="div4">4</div>
58 <div class="div5">5</div>
59 <div class="div6">6</div>
60 <div class="div7">7</div>
61 <div class="div8">8</div>
62 <div class="div4">4</div>
63 <div class="div5">5</div>
64 <div class="div6">6</div>
65 <div class="div7">7</div>
66 <div class="div8">8</div>
67 <div class="div4">4</div>
68 <div class="div5">5</div>
69 <div class="div6">6</div>
70 <div class="div7">7</div>
71 <div class="div8">8</div>
72 <div class="div1">1</div>
73
74 </div>
75 </body>
76 </html>
解决办法就是在小盒子后面添加标签 i 或者span标签，然后不设置高度，宽度和小盒子.box 下的div宽度一样就可以
问题来了设置几个呢，答案是设置该行的n-2个，比如说一行有4个那么写2个就可以了，如果有5个写3个就可以了
原理就是用 i 标签去占据位置，如果还不明白可以给i添加高度和背景色。再查看
然后再减去一个div第二个 i 就会上来
