uni小程序獲取image圖片長寬信息

引用wx.getImageInfo方法

  public getImageInfo(src): any {
    return new Promise((resolve, reject) => {
      wx.getImageInfo({
        src: src,
        success: (res) => {
          resolve(res);
        },
        fail: (err) => {
          reject(err);
        }
      });
    });
  }

方法返回的是Promise格式數組，需要提取數據

public draw(src) {
    this.getImageInfo(src).then((res) => {
        this.coverHeight = res.height;
        this.coverWidth = res.width;
    }).catch((err) => console.log(err));
}