1,添加跳过内存缓存；2，添加图片签名，防止URL不变，但图片已改变，加载的图片没有刷新#2
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luncang wants to merge 1 commit intolibin7278:masterfrom
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1,添加跳过内存缓存；2，添加图片签名，防止URL不变，但图片已改变，加载的图片没有刷新#2luncang wants to merge 1 commit intolibin7278:masterfrom
luncang wants to merge 1 commit intolibin7278:masterfrom
