<div class="container">
    <div class="left"></div>
    <div class="center">float解决方案，DOM顺序与视觉顺序不符</div>
    <div class="right"></div>  
</div>

方法1 浮动布局（float+margin/padding）

.left {
  width: 300px;
  float: left;
  height: 500px;
  background: #FF79BC;
}
.center {
  height: 500px;
  font-size: 30px;
  color: #fff;
  background: #666;
  margin: 0 300px;
}
.right {
  width: 300px;
  height: 500px;
  float: right;
  background: #CA8EFF;
}

方法2 浮动布局（float+calc）

.left {
  height: 500px;
  width: 300px;
  float: left;
  background: cadetblue;
}
.center {
  width: calc(100% - 600px);
  height: 500px;
  display: inline-block;
  /* 将display: inline-block;改为float布局也可以 */
  background: cornflowerblue;
}
.right {
  height: 500px;
  width: 300px;
  float: right;
  background: chocolate;
}

方法3 绝对定位布局（absolute+margin）

.container {
    height: 100%;
    position: relative;
}

.left {
    position: absolute;
    top: 0;
    left: 0;
    width: 300px;
    height: 100%;
    background: cadetblue;
}

.right {
    position: absolute;
    top: 0;
    right: 0;
    width: 300px;
    background: cornflowerblue;
    height: 100%;
}

.center {
    margin: 0 300px;
    background: cornsilk;
    height: 100%;
}

方法4 table布局

.container {
    display: table;
    width: 100%;
    background: gray
}

.left,.center,.right {
    display: table-cell;
    height: 500px;
}
.left{
    width:300px;
    background: darkblue
}
.right{
    width:300px;
    background: darkgreen
}

方法5 flex布局

.container {
    display: flex;
}
.left {
    flex: 0 0 300px;
    background: cornflowerblue;
}

.center {
    flex: 1;
    background: cadetblue;
}

.right {
    flex: 0 0 300px;
    background: cornsilk;
}

方法6 grid布局

.container {
  display: grid;
  grid-template-columns: 300px auto 300px;
  grid-template-rows: 500px;
}

.left {
  background: cadetblue;
}

.right {
  background: chocolate;
}

.center {
  background: cornsilk;
}

方法7 圣杯布局

圣杯布局时要注意中间和左边元素的位置要换一下。

<div class="container">
    <div class="center">float解决方案，DOM顺序与视觉顺序不符</div>
    <div class="left"></div>
    <div class="right"></div>  
</div>

.container {
    padding: 0 300px;
    overflow: hidden;
}

.left,
.right,
.center {
    position: relative;
    float: left;
    min-height: 100px;
    height: 500px;
}

.left {
    right: 300px;
    margin-left: -100%;
    width: 300px;
    background: red;
}

.center {
    width: 100%;
    background: #bfefff;
}

.right {
    left: 300px;
    margin-left: -300px;
    width: 300px;
    background: blue;
}