加载远程图片

userHead.getComponent('ImageUrl').loadUrl(url);

userHead.getComponent('ImageUrl').loadUrl(url,'png');

/**
  * @description: 获取Url图
  * @param {string} url 路径
  * @param {string} type 图片类型，如:png
  * @return:
  */
loadUrl(url, type = null){
   this.checkDefault();
   if(url == null || url == ''){
      cc.error('invalid url', url);
      this.getComponent(cc.Sprite).spriteFrame = this._defaultSpf;
      return;
    }

    cc.loader.load(typeof type == 'string'? {url: url, type: type}: url, (err, texture) => {
        if(err != null){
            cc.error(url, err);
            return;
        }

        // 根据默认大小显示
        this.getComponent(cc.Sprite).spriteFrame = new cc.SpriteFrame(texture);
        let size = this._defaultSpf.getOriginalSize();
        this.node.width = size.width;
        this.node.height = size.height;
    });
},