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console 命令行工具 X clear

                    
>
console
<div class="center">
    <div class="content">
        <span>2344</span>
    </div>
</div>
.center {
    display: table-cell;
    width: 400px;
    height: 500px;
    vertical-align: middle;
}

.content {
    // display:inline-block;
    width: 100px;
    height: 100px;
}