远程图片
在真机上测试时 image组件只能显示http请求的图片， 对https 与 //xxx.xxx.xx 之类的不能显示。
可显示
'http://img.alicdn.com/i2/83231071/TB2B03RsYplpuFjSspiXXcdfFXa_!!83231071.jpg', "http://img.alicdn.com/i2/83231071/TB2uTODub0kpuFjy0FjXXcBbVXa_!!83231071.jpg", "http://img.alicdn.com/i3/83231071/TB2sTNajr_0UKFjy1XaXXbKfXXa_!!83231071.jpg", "http://img.alicdn.com/i2/83231071/TB2r3S5q30kpuFjSspdXXX4YXXa_!!83231071.jpg"
不能显示
'https://img.alicdn.com/i2/83231071/TB2B03RsYplpuFjSspiXXcdfFXa_!!83231071.jpg', "https://img.alicdn.com/i2/83231071/TB2uTODub0kpuFjy0FjXXcBbVXa_!!83231071.jpg", "https://img.alicdn.com/i3/83231071/TB2sTNajr_0UKFjy1XaXXbKfXXa_!!83231071.jpg", "https://img.alicdn.com/i2/83231071/TB2r3S5q30kpuFjSspdXXX4YXXa_!!83231071.jpg"
'//img.alicdn.com/i2/83231071/TB2B03RsYplpuFjSspiXXcdfFXa_!!83231071.jpg', "//img.alicdn.com/i2/83231071/TB2uTODub0kpuFjy0FjXXcBbVXa_!!83231071.jpg", "//img.alicdn.com/i3/83231071/TB2sTNajr_0UKFjy1XaXXbKfXXa_!!83231071.jpg"
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