• 在vue中使用微信jssdk的getLocalImgData怎么让多张图片显示


    在循环里添加了一个异步请求类型的,所以我让他每次执行完毕后再执行下一次操作,其中用到了async 和 await,将异步变为同步去执行。

     1 // 图片上传
     2     handleImage(typeVal) {
     3       const uploadObj = this.imgData.uploadType.find(
     4         (item) => item.typeVal === typeVal
     5       );
     6       const count = uploadObj ? 5 - uploadObj.addFiles.length : 5; //图片数量
     7       const that = this;
     8       wx.chooseImage({
     9         count: count,
    10         sizeType: ["original", "compressed"], // 可以指定是原图还是压缩图,默认二者都有
    11         sourceType: ["album", "camera"], // 可以指定来源是相册还是相机,默认二者都有
    12         success: function (res) {
    13           that.$toast.loading({
    14             message: "加载中...",
    15             duration: 0,
    16             forbidClick: true,
    17           });
    18           var localIds = res.localIds; // 返回选定照片的本地ID列表,localId可以作为img标签的src属性显示图片
    19           that.localIds = res.localIds;
    20           that.readImages(localIds, typeVal);
    21         },
    22         fail: function () {
    23           that.$toast.clear(); //关闭加载
    24         },
    25       });
    26     },
    1   async readImages(localIds, typeVal) {
    2        this.imgFiles = [];
    3        for (var i = 0; i < localIds.length; i++) {
    4          await this.doReadImage(localIds[i], typeVal,i);
    5        }
    6    },     
      doReadImage(localId, typeVal,i) {
           const that = this;
           return new Promise((resolve) => {
             wx.getLocalImgData({
               //获取图片Base64数据
               localId, // 图片的localID
               success: function (res) {
                 var localData = res.localData; // localData是图片的base64数据,可以用img标签显示
                 if (localData.indexOf("data:image") < 0) {
                  //安卓处理
                   localData = "data:image/jpeg;base64," + localData;
                 }
                 //base64转文件流
                 const fileData = that.dataURLtoFile(localData);
                 //不压缩图片
                 //files.push({data:localData,size:fileData.size});
                 //压缩图片
                 that.imgFiles.push(fileData);
                 const files = that.imgFiles;
                 if (i+1 === that.localIds.length) {
                   that.uploadIpt({ files }, typeVal);
                 }
                 resolve("done!");
               },
               fail: function () {
                 that.$toast.clear(); //关闭加载
               },
             });
           });
         },
      //base64转文件流
         dataURLtoFile(dataurl, filename = "") {
           var arr = dataurl.split(","),
             mime = arr[0].match(/:(.*?);/)[1],
             bstr = atob(arr[1]),
             n = bstr.length,
             u8arr = new Uint8Array(n);
           while (n--) {
             u8arr[n] = bstr.charCodeAt(n);
           }
           return new File([u8arr], filename, { type: mime });
         },
    那些看似不起波澜的日复一日,会突然在某一天让人看到坚持的意义。
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  • 原文地址:https://www.cnblogs.com/Dcode/p/14511357.html
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