CSSで等高レイアウトを実装する方法は何ですか

 <div class="layout parent">
        <div class="left"><p>left</p></div>
        <div class="center">
            <p>我是中间部分的内容</p>
            <p>我是中间部分的内容</p>
            <p>我是中间部分的内容</p>
            <p>我是中间部分的内容</p>
        </div>
        <div class="right"><p>right</p></div>
        <div style="clear: both;">11111111111</div>
    </div>

.parent{
    position: relative;
    overflow:hidden;
    color: #efefef;
}
.center,
.left,
.right {
    box-sizing: border-box;
    float: left;
}
.center {
    background-color: #2ECC71;
    width: 60%;
}

.left {
    width: 20%;
    background-color: #1ABC9C;
}
.right {
    width: 20%;
    background-color: #3498DB;
}
.left,
.right,
.center  {
    margin-bottom: -99999px;
    padding-bottom: 99999px;
}

  <div class="layout parent">
        <div class="left"><p>left</p></div>
        <div class="center">
            <p>我是中间部分的内容</p>
            <p>我是中间部分的内容</p>
            <p>我是中间部分的内容</p>
            <p>我是中间部分的内容</p>
        </div>
        <div class="right"><p>right</p></div>
        <div style="clear: both;">11111111111</div>
    </div>

    .parent{
        position: relative;
        display: table;
        color: #efefef;
    }
    .center,
    .left,
    .right {
        box-sizing: border-box;
        display: table-cell
    }
    .center {
        background-color: #2ECC71;
        width: 60%;
    }

    .left {
        width: 20%;
        background-color: #1ABC9C;
    }
    .right {
        width: 20%;
        background-color: #3498DB;
    }

   .parent{
        position: absolute;
        color: #efefef;
        width:100%;
        height: 200px;
    }

    .left,
    .right,
    .center {
        position: absolute;
        box-sizing: border-box;
        top:0;
        bottom:0;
    }
    .center {
        background-color: #2ECC71;
        left: 200px;
        right: 300px;
    }

    .left {
        width: 200px;
        background-color: #1ABC9C;
    }
    .right {
        right:0;
        width: 300px;
        background-color: #3498DB;
    }

.parent{
    display: flex;
    color: #efefef;
    width:100%;
    height: 200px;
}

.left,
.right,
.center {
    box-sizing: border-box;
    flex: 1;
}
.center {
    background-color: #2ECC71;
}
.left {
    background-color: #1ABC9C;
}
.right {
    background-color: #3498DB;
}

    .parent{
        display: grid;
        color: #efefef;
        width:100%;
        height: 200px;
        grid-template-columns: 1fr 1fr 1fr;
    }

    .left,
    .right,
    .center {
        box-sizing: border-box;
    }
    .center {
        background-color: #2ECC71;
    }
    .left {
        background-color: #1ABC9C;
    }
    .right {
        background-color: #3498DB;
    }

    .parent{
        overflow: auto;
        color: #efefef;
    }
    .left,
    .right,
    .center {
        float: left;
    }
    .center {
        width: 60%;
        background-color: #2ECC71;
    }
    .left {
        width: 20%;
        background-color: #1ABC9C;
    }
    .right {
        width: 20%;
        background-color: #3498DB;
    }

     // 获取最高元素的高度
    var nodeList = document.querySelectorAll(".parent > div");
    var arr = [].slice.call(nodeList,0);
    var maxHeight = arr.map(function(item){
        return item.offsetHeight
    }).sort(function(a, b){
        return a - b;
    }).pop();
    arr.map(function(item){
        if(item.offsetHeight < maxHeight) {
            item.style.height = maxHeight + "px";
        }
    });