获得后缀名判断类型,如果是图片用ex.previewImage(),如果是视频,用uni.previewMedia(),如果是word文档这些的,用 uni.downloadFile来下载资源后用 uni.saveFile来保存到本地,uni.openDocument来打开新的网页,如果打不开的话则返回说到PC端去打开

 const lookFile = (url) => {let index = url.lastIndexOf('.');let filttype = url.slice(index + 1);if (url.includes('?token')) {filttype = url.split('?token')[0].split('.').slice(-1);}uni.showLoading({title: '加载中',mask: true,});if (['bmp', 'jpg', 'jpeg', 'png', 'gif', 'image'].some((item) => item == filttype)) {uni.previewImage({current: url, // 当前显示图片的 http 链接urls: [url], // 需要预览的图片 http 链接列表success() {uni.hideLoading();},});} else if (['mp4', 'avi'].some((item) => item == filttype)) {uni.previewMedia({sources: [{url,type: 'video',},], // 需要预览的资源列表current: 1, // 当前显示的资源序号,success() {uni.hideLoading();},fail: function (err) {uni.showToast({title: '播放失败',icon: 'none',});console.log(err);},});} else if (['zip', 'rar'].some((item) => item == filttype)) {uni.showToast({title: '暂不支持预览',icon: 'none',});} else {uni.downloadFile({//下载url, // 从后端获取的url地址，赋值在标签的data属性上header: {token: uni.getStorageSync('token'),'content-type': 'application/x-www-form-urlencoded;charset=UTF-8',},success: function (res) {const tempFilePath = res.tempFilePath;uni.openDocument({//新开页面打开文档filePath: tempFilePath,showMenu: true,fileType: filttype,success: function (res) {console.log('打开文档成功');},fail: function (err) {console.log('打开文档失败', err);},complete: () => {uni.hideLoading();},});/* uni.saveFile({//保存文件到本地tempFilePath,success(res) {const savedFilePath = res.savedFilePath;const filttypeName = filttype;uni.openDocument({//新开页面打开文档filePath: savedFilePath,showMenu: true,fileType: filttypeName,success: function (res) {console.log('打开文档成功');},fail: function (err) {console.log('打开文档失败', err);},complete: () => {uni.hideLoading();},});},}); */},fail: function (err) {uni.showToast({title: '下载失败',icon: 'none',});console.log(err);},});}
};