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这里的js为什么只能写
“ style.display = style.display == "block" ? "none" : "block"
”而不能直接写成
“ style.display = "block" ? "none" : "block"
“
相当于style.display = (style.display == "block" ? "none" : "block");
style.display == "block" ? "none" : "block";这是一个判断语句，结果为"none"或"block"
然后赋值给style.display
而style.display = "block" ? "none" : "block"这句话中没有精确判断
"block"?"none":"block";这句话只是判断"block"永远为真
而不能判断div是否为显示
判断字符串一定要用==的