{"action":"opened","issue":{"url":"https://api.github.com/repos/Vxee/articles/issues/3","repository_url":"https://api.github.com/repos/Vxee/articles","labels_url":"https://api.github.com/repos/Vxee/articles/issues/3/labels{/name}","comments_url":"https://api.github.com/repos/Vxee/articles/issues/3/comments","events_url":"https://api.github.com/repos/Vxee/articles/issues/3/events","html_url":"https://github.com/Vxee/articles/issues/3","id":336203465,"node_id":"MDU6SXNzdWUzMzYyMDM0NjU=","number":3,"title":"css中的层叠","user":{"login":"Vxee","id":14934370,"node_id":"MDQ6VXNlcjE0OTM0Mzcw","avatar_url":"https://avatars1.githubusercontent.com/u/14934370?v=4","gravatar_id":"","url":"https://api.github.com/users/Vxee","html_url":"https://github.com/Vxee","followers_url":"https://api.github.com/users/Vxee/followers","following_url":"https://api.github.com/users/Vxee/following{/other_user}","gists_url":"https://api.github.com/users/Vxee/gists{/gist_id}","starred_url":"https://api.github.com/users/Vxee/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Vxee/subscriptions","organizations_url":"https://api.github.com/users/Vxee/orgs","repos_url":"https://api.github.com/users/Vxee/repos","events_url":"https://api.github.com/users/Vxee/events{/privacy}","received_events_url":"https://api.github.com/users/Vxee/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2018-06-27T12:15:00Z","updated_at":"2018-06-27T12:15:00Z","closed_at":null,"author_association":"OWNER","body":"在默认情况下元素没有设置z-index，该如何判断哪个元素在上，哪个在下？是html中的位置前后吗？其实并不是。有一个层叠顺序图。\r\n![image](https://user-images.githubusercontent.com/14934370/41972631-fcae21ee-7a44-11e8-88c5-b21477c95338.png)\r\n\r\n"}}
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