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Taro.getImageInfo( { src: path, success: function (res) { resolve(res) }, fail: function (res) { reject(res) } } ) path为网络图片，在success里面打印出res，结果如图：
getImageInfo在h5端的实现没有将图片下载下来 所以能提供的参数仅限于宽高。
