单项选择题
A.1.x版B.2.x版C.3.x版D.以上都不是
A.$("li:eq(3)").css("background-color","red")B.$("li:lt(3)").css("background-color","red")C.$("li:not(:eq(3))").css("background-color","red")D.$("li:even").css("background-color","red")
A.$("img").attr("src","img/1.jpg")B.$("img").attr("src":"img/1.jpg")C.$("img").attr(src,img/1.jpg)D.$("img").attr(src:img/1.jpg)
A.slideDown()是将元素向上滑动B.slideUp()是将元素向上滑动C.slideToggle()是将元素向下滑动D.slideUp()是将元素向下滑动
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