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From JavaScript discussion group
对象用引用去比较而不是用值中“引用”是什么意思？
From PHP discussion group
php中属性就是变量，方法就是函数。这句话对吗？
From CSS discussion group
CSS 用margin来控制元素位置怎么样？
伪元素:after和 :before 存在的意义？
CSS 的 ID 和 Class 有什么区别？如何正确使用它...
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