左侧固定，右侧自适应的布局方式(新增评论区大佬教的方法）

一.浮动布局

1.先让固定宽度的div浮动！使其脱离文档流。

2.margin-left的值等于固定div的宽度相等。

.aside{
        float: left;
        width: 200px;
        background-color: red;
    }
    .content{
        margin-left: 200px;
        background-color: blue;
    }
    
<div class="aside">
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Labore provident dolor in voluptatum tempore non, placeat obcaecati totam ut delectus libero excepturi distinctio asperiores odit nobis soluta, esse aspernatur beatae.
</div>
<div class="content">
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Labore provident dolor in voluptatum tempore non, placeat obcaecati totam ut delectus libero excepturi distinctio asperiores odit nobis soluta, esse aspernatur beatae.
</div>

           

二.margin的负值(3个div)

1. 是固定宽度的div脱离文档流。
2. 利用marin负值可以使得，后面的div可以与前面的div 保持同行显示。
3. 给包裹内容的div加margin-left 可以使得与左边的文字不重叠

.aside{
    float: left;
    margin-right: -200px;
    width: 200px;
    background-color: red;
}
.content{
    float: right;
}
.content .inner{
    margin-left: 200px;
    background-color: blue;
}

 <div class="aside">
   Lorem ipsum dolor sit amet, consectetur adipisicing elit. Labore provident dolor in voluptatum tempore non, placeat obcaecati totam ut delectus libero excepturi distinctio asperiores odit nobis soluta, esse aspernatur beatae.
</div>
<div class="content">
   <div class="inner">
      Lorem ipsum dolor sit amet, consectetur adipisicing elit. Labore provident dolor in voluptatum tempore non, placeat obcaecati totam ut delectus libero excepturi distinctio asperiores odit nobis soluta, esse aspernatur beatae.
   </div> 
           

</div>

三.calc()计算属性

注意：使用calc计算属性的时候 运算符(- +等等)两边必须有空格

1. 注意两个div必须一左一右浮动。
2. calc的宽度必须要减去的宽度要与固定宽度保持一致。

.aside{
      float: left;
      width: 200px;
      background-color: red;
  }
  .content{
      calc:(100% - 200px);
      background-color: blue;
  }
           

<div class="aside">

Lorem ipsum dolor sit amet, consectetur adipisicing elit. Labore provident dolor in voluptatum tempore non, placeat obcaecati totam ut delectus libero excepturi distinctio asperiores odit nobis soluta, esse aspernatur beatae.
   </div>
 <div class="content">
     Lorem ipsum dolor sit amet, consectetur adipisicing elit. Labore provident dolor in voluptatum tempore non, placeat obcaecati totam ut delectus libero excepturi distinctio asperiores odit nobis soluta, esse aspernatur beatae.        
  </div>

           

四.flex布局

1. 需要给父级div设置display: flex属性。
2. 固定宽度的div设置flex: 0 0 200px即可。
3. 内容区域的div直接写出flex: 1即可。

.container{
    display: flex;
}
.aside{
    flex: 0 0 200px;
    background-color: red; 
}
.content{
    flex: 1;
    background-color: blue;
}
<div class="container">
    <div class="aside">
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Labore provident dolor in voluptatum tempore non, placeat obcaecati totam ut delectus libero excepturi distinctio asperiores odit nobis soluta, esse aspernatur beatae.
    </div>
    <div class="content">
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Labore provident dolor in voluptatum tempore non, placeat obcaecati totam ut delectus libero excepturi distinctio asperiores odit nobis soluta, esse aspernatur beatae.
    </div>
</div>

           

五.左侧浮动，右侧overflow:hidden

.aside{
    width: 200px;
    float: left;
    background-color: red;
}
.content{
    overflow: hidden;
    background-color: blue;
}
<div class="aside">
        Lorem ipsum dolor sit amet, consectetur adipisicing elit. Labore provident dolor in voluptatum tempore non, placeat obcaecati totam ut delectus libero excepturi distinctio asperiores odit nobis soluta, esse aspernatur beatae.
    </div>
    <div class="content">
        Lorem ipsum dolor sit amet, consectetur adipisicing elit. Labore provident dolor in voluptatum tempore non, placeat obcaecati totam ut delectus libero excepturi distinctio asperiores odit nobis soluta, esse aspernatur beatae.
    </div>
           

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原文地址：https://segmentfault.com/a/1190000016694777