CSS里的 no-repeat是针对背景图片来说的.当你设置了no-repeat这个属性后,你的背景图片将不会被重复,再换一种说法,你在网站上所看到的背景图片就是你所添加的图片, 不会出现平铺或者重复的现象. 你仍然可以通过其他方式来控制图片的位置,比如: {backgroud:top, center, no-repeat;} 这样你的背景图片就位于上部的居中位置.

1.while循环 DELIMITER $$ DROP PROCEDURE IF EXISTS `sp_test_while`$$ CREATE PROCEDURE `sp_test_while`( IN p_number INT, #要循环的次数 IN p_startid INT #循环的其实值 ) BEGIN DECLARE v_val INT DEFAULT 0; SET v_val=p_startid; outer_label: BEGIN #设置一个标记 WHILE v_val<=p_

循环一般在存储过程和存储函数中使用频繁,这里只给出最简单的示例 while delimiter $$ create procedure test_while() begin declare sum int default 0; declare t int default 5; while t>0 do set sum=sum+1; set t=t-1; end while; select sum; end $$ delimiter ; repeat delimiter $$ create pro

在 MySQL-procedure(cursor,loop) 中将spam_keyword表中的文字全部分割到t表当中,且每一行的字都不重复,那t表可以用来当作一个小字典,只有1000来个字符,这次把t表当作字符来源,写一个”以 t 表为字符库生成不定长随机字符的procedure“. 1.t表使用的是InnoDB引擎,为了有个区别比较,再新建一个t2表,用MyISAM引擎并复制t的数据,共1023行记录 create table t2 like t; alter table t2 engine

if语法 :   if [ expression ]    then   commandselif [ expression2 ]   then   commandselse   commandsfi       case 语法:   case string1 in   str1)    commands;;   str2)    commands;;   *)    commans;;esac       循环语句 for 语法:    for  var in list do     comm

截取操作,可用于浮点数. Mathf.Repeat(Time.realtimeSinceStartup, 3*blinkTime) > blinkTime;

一.repeat语句格式repeat语句用于"重复执行循环体,直到指定的条件为真时为止" repeat语句格式:repeat  语句1;  语句2;  --  语句n;until 布尔表达式; repeat重复基本上有与while重复一样的描述循环计算的能力,但有三点不同:1.在repeat语句中,布尔表达式求值在循环体执行之后,而在while语句中,布尔表达式求值在循环体执行之前.2.while语句的循环体部分只能是一个语句,因此当重复动作包含几个语句时,需用begin和end使它们

重复一个指定的字符串 num次,如果num是一个负数则返回一个空字符串. /*思路 fo循环将字符串重复num次并组成数组 将数组组成新的字符串并返回 */ function repeat(str, num) { var myarr=[]; for(var i=0;i<num;i++){ myarr[i]=str; } return myarr.join(""); } repeat("abc", 3); /*定义数组为空数组,如果num<0,则不会遍历,

js将字符串重复N次的repeat方法的8个版本 /* *@desc: 将一个字符串重复自身N次 */ //版本1:利用空数组的join方法 function repeat(target, n) { return (new Array(n + 1)).join(target); } //版本2:之所以要创建一个带length属性的对象 是因为要调用数据的原型方法,需要指定call的第一个参数为类数组对象 //类数组对象的必要条件是其length属性的值为非负数 function repeat(t

C - History repeat itself Time Limit:1000MS     Memory Limit:32768KB      Description Tom took the Discrete Mathematics course in the 2011,but his bad attendance angered Professor Lee who is in charge of the course. Therefore, Professor Lee decided t

转自:http://www.wiseowl.co.uk/blog/s148/group-pane-advanced-mode.htm Repeating Page Headers in Reporting Services 2008 R2 Part two of a two-part series of blogs Getting rows of a table to repeat at the top of each page of a report in SSRS 2008 R2 is an

History repeat itself Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u Submit Status Practice HDU 4342 Description Tom took the Discrete Mathematics course in the 2011,but his bad attendance angered Professor Lee who is in

<JavaScript 框架设计> 版本1: function repeat(target, n) { return (new Array(n + 1)).join(target) } 版本2: function repeat(target, n) { return Array.prototype.join.call({length: n + 1}, target) } 版本3:(缓存) var repeat = (function() { var join = Array.prototype

七.聚合操作符 聚合函数将在序列上执行特定的计算,并返回单个值,如计算给定序列平均值.最大值等.共有7种LINQ聚合查询操作符:Aggregate.Average.Count.LongCount.Max.Min和Sum. 1. Aggregate Aggregate操作符对集合值执行自定义聚合运算.例如,需要列出所有产品类别清单,每个类别名称之间用顿号连接.以下的代码演示了这一过程: //方法语法 var q = db.Categories .Select(c => c.CategoryName

Kolya got string s for his birthday, the string consists of small English letters. He immediately added k more characters to the right of the string. Then Borya came and said that the new string contained a tandem repeat of length l as a substring. H

You selected "Repeat header rows on each page" or "Keep header rows visible while scrolling" in the tablix properties dialog, but it doesn't seem to work as expected? You might want to try the following four steps if you are using a &q

DRY是指Don't Repeat Yourself特指在程序设计以及计算中避免重复代码,因为这样会降低灵活性.简洁性,并且可能导致代码之间的矛盾.<The Pragmatic Programmer>对这一思想做了很好的阐述. 把一切重复的代码抽象出来.我觉得最主要的原因是很好维护,当需要改动时只需要改动一次. 代码复用的层次:函数级别复用,对象级别复用,接口级别的,类库级别复用,框架级别复用.注:我们目前还处在“函数级别复用”上.(这个最基本的做好也减少了不少重复代码.....) 另一个有关

Operator repeat() is somewhat similar to retry(), but is not for handling operators. In this lesson we learn how repeat works. var foo = Rx.Observable.interval(500) .zip(Rx.Observable.of('a','b','c','d'), (x,y)=>y); var bar = foo.map(x => x.toUpperC

question: I am using SimpleTrigger to schedule a job which is supposed to run indefinitely (repeat count -1). And i am using JDBC store to persist the job state in DB. But the trigger is firing for some intervals (in my case always 8) and goes to BLO

B. Kolya and Tandem Repeat time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Kolya got string s for his birthday, the string consists of small English letters. He immediately added k more ch

When you complete a stream, there’s no way to restart it, you must resubscribe. This lesson shows how repeat comes in handy to resubscribe after a stream has completed. Current this block of code: const timer$ = starters$ .switchMap(intervalActions)