保存下载图片（taro h5）

最新推荐文章于 2025-04-01 15:58:40 发布

原创最新推荐文章于 2025-04-01 15:58:40 发布 · 2k 阅读

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#h5保存图片

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saveimgWeb() {
    let timestamp = new Date().getTime();
    let imgData = this.state.qrcodeInfo.fullviewimg; //填写你的base64
    // let imgData = "data:image/png;base64," + this.state.qrcodeInfo.fullviewimg; //填写你的base64
    this.downloadFile(
      this.state.qrcodeInfo.commendcode + "_" + timestamp + ".png",
      imgData
    );
  }
  downloadFile(fileName, content) {
    let aLink = document.createElement("a");
    let blob = this.base64ToBlob(content); //new Blob([content]);

    let evt = document.createEvent("HTMLEvents");
    evt.initEvent("click", true, true); //initEvent 不加后两个参数在FF下会报错  事件类型，是否冒泡，是否阻止浏览器的默认行为
    aLink.download = fileName;
    aLink.href = URL.createObjectURL(blob);

    // aLink.dispatchEvent(evt);
    aLink.click();
  }
  //base64转blob
  base64ToBlob(code) {
    let parts = code.split(";base64,");
    let contentType = parts[0].split(":")[1];
    let raw = window.atob(parts[1]);
    let rawLength = raw.length;

    let uInt8Array = new Uint8Array(rawLength);

    for (let i = 0; i < rawLength; ++i) {
      uInt8Array[i] = raw.charCodeAt(i);
    }
    return new Blob([uInt8Array], { type: contentType });
  }

    <View className="font_size_24 font_color_999" onClick={this.saveimgWeb.bind(this)}>长按保存图片分享给好友</View>