这是做什么的，为什么这样宣布？
var shroom = 'data:image/gif;base64,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%3D%3D';
答案 0 :(得分：7)
它表示以base 64编码的GIF图像。
答案 1 :(得分：1)
答案 2 :(得分：0)
这是一个数据URI，它是一个以URL编码的文件。更多信息可以在维基百科上找到。这是一个用于创建它们的在线工具： http://software.hixie.ch/utilities/cgi/data/data
我相信IE并不完全支持数据URI，所以它们并不常用。但是，如果IE确实如此，它们对于嵌入样式表的图标和小图形非常有用。
答案 3 :(得分：0)
这是使用Javascript
编码base 64的链接