uniapp 设置背景图片

uniapp 由于其特殊机制，导致了背景图片不能引用本地图片。只能通过 转成 base64 来进行设置

附上链接：https://oktools.net/image2base64 图片转成base64的网址，百度一大推

找一个空白页面

随便设置一个 class 名字，然后填充内容

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);
    background-size:100%;
    // height: 600upx; //立即看效果的可以设置宽高，用内容填充的就不需要
    // width: 100%;
    background-size: contain;
    background-repeat: no-repeat;