1.首先引用jquery和html2canvas　　方法略不会的请百度2.添加截图按钮<buttontype="button"id="savePic"class="btnbtn-primarybtn-smmixStream"v-on:click="savePic">截图</button>3.创建...

//保存saveFile(data,filename){constsave_link=document.createElementNS('http://www.w3.org/1999/xhtml','a');save_link.href=data;save_link.download=filename;consteve...

    oracle的函数介绍之nvl　　  函数声明：nvl(col,val)　　  说明：当col为空时取val作为返回值，当col不为空时取col值。　　例如: selectnvl(name,'张三'),age,sexfro...

文章转自  http://www.cnblogs.com/annsshadow/p/5037667.htmlhttps://www.cnblogs.com/cuisi/p/7685893.html...

文章转自  https://www.cnblogs.com/su-han/p/6204016.htmlhttps://www.cnblogs.com/mydriverc/p/8297108.htmlhttps://www.cnblogs.com/perfei/p/9689741.htmlhttps:...

 文章参考自 https://www.cnblogs.com/weiok/p/5672238.html第一种1、查询showprocesslist2、杀死kill Id第二种1、使用navicate 3、查询当前事务select*frominformation_schema.in...

文章转自 https://zhidao.baidu.com/question/15311803.htmlhttps://support.microsoft.com/zh-cn/help/320314/description-of-the-guidelines-for-selecting-the-appropr...

mongodb多层嵌套查询官网案例：db.inventory.insertMany([{item:"journal",instock:[{warehouse:"A",qty:5},{warehouse:"C",qty:15}]},{item:"notebook",instock:[{warehouse:"C",qty:...

我认为一条很简单的SQL然后跑了很久，明明我已经都建立相应的索引，逻辑也不需要优化。SELECTa.custid,b.score,b.xcreditscore,b.lrscoreFROM(SELECTDISTINCTcustidFROMsync.`credit_apply`WHERESUBSTR(createtime,...

<divclass="item"><spanclass="btnleft"@click="prevIndex">&lt;</span><divv-for="(imgUrl,index)inbannerList"v-show="index===mark":key="ind...

funloadPreviewImage(context:Context,url:String,target:ImageView){valrequestOptions=RequestOptions().diskCacheStrategy(DiskCacheStrategy.ALL).override(Target.SIZ...

1.　必须GLThread线程里调用funsaveFrame(filename:String,width:Int,height:Int){valstartTime=System.currentTimeMillis()//1.glReadPixels返回的是大端的RGBAByte组数，我们使用小端Buffer接收得到AB...

(7)SELECT(8)DISTINCT<select_list>(1)FROM<left_table>(3)<join_type>JOIN<right_table>(2)ON<join_condition>(4)WHERE<where_conditio...

基本的连接方式非常简单，只需要在WHERE子句中规定如何关联即可，如下：SELECTvend_name,prod_name,prod_priceFROMvendors,productsWHEREvendors.vend_id=products.vend_idORDERBYvend_name,prod_name;11&n...

 ImageClassusingSystem;usingSystem.Collections;usingSystem.IO;usingSystem.Drawing;usingSystem.Drawing.Imaging;usingSystem.Drawing.Drawing2D;namespaceCZBK.I...