app端
webview因为安全策略和权限问题 无法访问本地文件
file:/// 协议无法使用 只能用http
Fetch API cannot load file:///storage/emulated/0/Android/data/io.dcloud.HBuilder/apps/HBuilder/www/uni_modules/ss-preview/hybrid/html/pdf-reader/17169677104600.pdf. URL scheme "file" is not supported.
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