{"action":"created","issue":{"url":"https://api.github.com/repos/sunjunjiegithub/learn_front_end_basic/issues/60","repository_url":"https://api.github.com/repos/sunjunjiegithub/learn_front_end_basic","labels_url":"https://api.github.com/repos/sunjunjiegithub/learn_front_end_basic/issues/60/labels{/name}","comments_url":"https://api.github.com/repos/sunjunjiegithub/learn_front_end_basic/issues/60/comments","events_url":"https://api.github.com/repos/sunjunjiegithub/learn_front_end_basic/issues/60/events","html_url":"https://github.com/sunjunjiegithub/learn_front_end_basic/issues/60","id":170432322,"number":60,"title":"z-index 究竟怎么比?","user":{"login":"sunjunjiegithub","id":13842760,"avatar_url":"https://avatars.githubusercontent.com/u/13842760?v=3","gravatar_id":"","url":"https://api.github.com/users/sunjunjiegithub","html_url":"https://github.com/sunjunjiegithub","followers_url":"https://api.github.com/users/sunjunjiegithub/followers","following_url":"https://api.github.com/users/sunjunjiegithub/following{/other_user}","gists_url":"https://api.github.com/users/sunjunjiegithub/gists{/gist_id}","starred_url":"https://api.github.com/users/sunjunjiegithub/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sunjunjiegithub/subscriptions","organizations_url":"https://api.github.com/users/sunjunjiegithub/orgs","repos_url":"https://api.github.com/users/sunjunjiegithub/repos","events_url":"https://api.github.com/users/sunjunjiegithub/events{/privacy}","received_events_url":"https://api.github.com/users/sunjunjiegithub/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":1,"created_at":"2016-08-10T14:33:12Z","updated_at":"2016-08-10T14:48:04Z","closed_at":null,"body":"参考:\r\n- [z-index 工作原理](http://www.w3cplus.com/css/how-z-index-works.html)"},"comment":{"url":"https://api.github.com/repos/sunjunjiegithub/learn_front_end_basic/issues/comments/238890420","html_url":"https://github.com/sunjunjiegithub/learn_front_end_basic/issues/60#issuecomment-238890420","issue_url":"https://api.github.com/repos/sunjunjiegithub/learn_front_end_basic/issues/60","id":238890420,"user":{"login":"sunjunjiegithub","id":13842760,"avatar_url":"https://avatars.githubusercontent.com/u/13842760?v=3","gravatar_id":"","url":"https://api.github.com/users/sunjunjiegithub","html_url":"https://github.com/sunjunjiegithub","followers_url":"https://api.github.com/users/sunjunjiegithub/followers","following_url":"https://api.github.com/users/sunjunjiegithub/following{/other_user}","gists_url":"https://api.github.com/users/sunjunjiegithub/gists{/gist_id}","starred_url":"https://api.github.com/users/sunjunjiegithub/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sunjunjiegithub/subscriptions","organizations_url":"https://api.github.com/users/sunjunjiegithub/orgs","repos_url":"https://api.github.com/users/sunjunjiegithub/repos","events_url":"https://api.github.com/users/sunjunjiegithub/events{/privacy}","received_events_url":"https://api.github.com/users/sunjunjiegithub/received_events","type":"User","site_admin":false},"created_at":"2016-08-10T14:48:04Z","updated_at":"2016-08-10T14:48:04Z","body":"1. z-index 只对position为fix, relative, albsolute有效\r\n2. 堆叠是依据是最近的定位父元素, 即堆叠上下文\r\n3. 同样是定位元素, 子元素上的元素设置z-index的堆叠次序怎么也比父元素高\r\n4. 不具有包含关系的, 就比较上下文元素的嵌套层次"}}
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