假设现有一地址: let url = "http://www.bilibili.com/yellowbooks.pdf";;
let fileName = url.match(/[^\/]+\.[^\/]+$/)[0]; //"yellowbooks.pdf" 提取文件名(不含后缀): let _fileName = fileName.replace(/\.(\w+)$/, ''); //"yellowbooks" 提取文件后缀: let fileEx = fileName.replace(/.+\./, ''); //"pdf" 提取文件所在地址: let fileAdd = url.replace(fileName, ''); //"http://www.bilibili.com/"; wxs写法
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