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flexbox 布局 設定 margin的問題

最近在練習flexbox 所以先不使用bootstrap
我想要我的布局如圖 每個1 2 3 4 5 之間可以自己設定margin

如圖:
我想要的布局

我剛知道了,只要在flexbox中設置 justify-content:space-between; ,就可以把1row剩餘的width,平均分配成margin了,而設置了flex-flow:row wrap;的話,當子項目超過100%就會自動斷行,比如說現在有個container和box,大致會是這樣。

.container{
    display:flex;
    justify-content:space-between;
    flex-flow:row wrap;
}

.box{
   flex-basis:30%;
}

如圖:
justify-content:space-between;
DEMO: https://jsfiddle.net/jasonHsi...

後來為了調整,又找到了一個屬性 flex-grow:1; 可以讓row剩下的width,被每個flex子項目平均分配,就是把justify-content拿掉,加上flex-grow:1;

.container{
    display:flex;
    flex-flow:row wrap;
}

.box{
   flex-basis:30%;
    flex-grow:1;
}

如圖:

flex-grow
DEMO:
https://jsfiddle.net/jasonHsi...

雖然很不錯,但是離我一開始想要做的布局有些出入,請問要如何利用flexbox完成這樣的布局呢?
我想要的布局


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<div class="row">
  <div class="col">1</div>
  <div class="col">2</div>
  <div class="col">3</div>
  <div class="col">4</div>
  <div class="col">5</div>
</div>
.row{
  display: flex;
  flex-wrap: wrap;
  background: red;
}
.col{
  box-sizing: border-box; 
  width: 30.333333%;
  margin: 10px 1.5%;
  background:#eee;
  height: 120px;
}

效果:codepen
clipboard.png


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