<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
宽度等于设备宽度 缩放比例1 最小1 最大1 不允许用户手动缩放
这样移动端的图片设置：
img{ max-width: 100%; vertical-align: top;} 这样属性 就不会超出屏幕宽度
div也是如此
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