existing classes that are outside my control class A { public void test () {} } classes under my control class B extends An implements I { public void test () { how to directly execute the default test method of I } } interface I { default voi...
import { Button } from antd ; import ReactDOM from react-dom ; import React from react ; import antd dist antd.css ; ReactDOM.render( <div> <Button type="primary">Primary< Button> <Button>...
for(var i=0;i<10;iPP){ fnArr[i]=(function(){ var n=i; return function(){ return n } })(); } for(var i=0;i<10;iPP){ (function(){ var n=i; fnArr[i]=function(){ retur...
for example, the assignment is as follows: var div = self.$refs[ dialog-wrap ].$refs[ wrap ]; this.$nextTick(() => { div.scrollTop = div.scrollHeight console.log( scrollHeight , div.scrollHeight) console.log( scrollTop , div.scro...
Wechat: if An is shared with B, B needs to like it. How to know whether B likes it or not (B may not follow the official account and cannot get openid) ...
under the premise that the created_at column is indexed. the data volume of the table is tens of millions of levels. explain shows that the number of rows scanned is 2 million select count (*) from users where created_at < 2018-08-28 0000lv 00l...