## Description
image组件保存设置的宽度超过750px或者高度超过1334px就无法保存, 错误信息：{"errorDesc":"Image is
empty","success":false}
并且无法保存原图。受限于设置图片的宽高
<!-- The brief description of the potential bug. -->
## Broken Example
示例：[http://dotwe.org/vue/db4fe25b3206fa6da7c212d805b43d99](http://dotwe.org/vue/db4fe25b3206fa6da7c212d805b43d99)
## Steps to Reproduce
<!-- Clear and concise steps to reproduce this bug. -->
[ Full content available at:
https://github.com/apache/incubator-weex/issues/1514 ]
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