多项选择题
改变class不为demo的div元素的背景色,以下哪些写法是错误的?()
A.$("div.demo").css("background","blue")
B.$("div:not(.demo)").css({"background":"blue"})
C.$("div:not(.demo)").css({"background","blue"})
D.$("div:not(.demo)").css("background","blue")
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