一、上传会用到的一些东西:
1.wx.chooseImage;
2.wx.uploadFile;
3.获取上传需要的签名(signature)和加密策略(policy)和上传url(host)的接口;
二、步骤拆解:
1.通过接口获取签名等信息;
2.选择图片得到filePath;
3.上传图片得到oss图片路径并渲染;
三、代码实现:
ossPolicy:{ OSSAccessKeyId: "LTAIEGwazoZUp6GV", accessid: "LTAIEGwazoZUp6GV", dir: "", expire: 1559634215, host: "http://dhb-business-card.oss-cn-aabbccdd.aliyuncs.com", policy: "eyJleHBpcmF0aW9uIjoiMjAxOS0wNi0wNFQxNTo0MzozNVoiLCJjb25kaXRpb25zIjpbWyJjb250ZW50LWxlbmd0aC1yYW5nZSIsMCwyMDk3MTUyMDBdLFsic3RhcnRzLXdpdGgiLCIka2V5Ii23Il1dfQ==", signature: "2n+ATkFZm23BWrXcfi7hHH9/c+Y=" } |
2.选择图片:
//选择图片 publishGallery() { var imageArray = [];// 多图临时路径数组 wx.chooseImage({ count: 9, // 默认9 sizeType: ['original', 'compressed'], // 可以指定是原图还是压缩图,默认二者都有 sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机,默认二者都有 success: function (res) { let filePath = res.tempFilePaths; this.uploadImg(filePath) } }) }, |
3.上传图片
// 上传图片 uploadImg(filePath){ let _this = this; _this.setData({ uploadPercent: true }) let { host, OSSAccessKeyId, policy, signature } = this.ossPolicy; let imgList = []; filePath.map((item) => { wx.uploadFile({ url: host, filePath: item, name: 'file', formData: { name: item, key: 'bbs/${filename}', success_action_status: '200', OSSAccessKeyId, policy, signature }, success: res => { if (res.statusCode === 200) { _this.setData({ uploadPercent: false }); const fileName = item.split('http://tmp/')[1]; imgList.push(`${host}/bbs/${fileName}`); _this.setData({ img_l: imgList }); } }, fail: res => { console.log(res) } }) }); }, |
注意事项:
1.上传中拼装的formData中的key为与后端约定的文件名,一般需要进行时间戳加密或者md5加密;
2.后面渲染图片时,imgList的拼装名一定要合key值对应,不然会出现问题;
3.如若需要对图片大小之类的进行一些限制,在chooseImage的success回调里对res.tempFiles进行相关处理;