es6 https://es6.ruanyifeng.com/#docs/object-methods
weex http://doc.weex.io/zh/docs/styles/common-styles.html#flexbox
react https://zh-hans.reactjs.org/docs/thinking-in-react.html
w3cschool https://www.w3school.com.cn/jsref/met_doc_getelementbyid.asp