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                1. 設置父元素height和line-height屬性值相等 * 缺點:僅適用于寬度固定的單行文本 2. 設置元素絕對定位(position:absolute),并設置top:50%;margin-height為負的height的一半 * 缺點:元素高度固定 ``` .container{ width: 200px; height: 200px; border: 1px solid red; position: relative; } .content{ background-color: #ccc; height: 50px; width: 100%; position: absolute; top: 50%; margin-top: -25px; } <div class="container"> <div class="content"></div> </div> ``` 3. 設置元素絕對定位(position:absolute),并設置top:50%;transform:translateY(-50%); * 缺點:transform屬性瀏覽器兼容性不好 4. 設置元素vertical-align:middle;并添加父元素:after偽元素,設置vertical-align:middle * 缺點:僅適用于行內元素、行內塊元素 ``` .wrapper { width: 500px; height: 500px; background-color: #ccc; text-align: center; } .wrapper:after { content: ''; height: 100%; width: 0; display: inline-block; vertical-align: middle; } .align { background-color: #f00; width: 20%; height: 20%; display: inline-block; vertical-align: middle; } <div class="wrapper"> <div class="align"></div> </div> ``` 5. 設置父元素display:flex;justify-content:center; * 缺點:flex布局瀏覽器兼容性不好 6. 設置元素絕對定位(position:absolute),并設置top:0;bottom:0;margin:auto; ``` .wrapper { position: relative; width: 500px; height: 500px; border: 1px solid red; } .content{ position: absolute; width: 200px; height: 200px; border: 1px solid green; top: 0; bottom: 0; left: 0; right: 0; margin:auto; } <div class="wrapper"> <div class="content"></div> </div> ```
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