精华内容
下载资源
问答
  • CSS各种对齐代码,左对齐、右对齐、中间对齐、底部对齐、两端对齐等,代码简单 /*CSS代码:*/ /*左对齐*/ .left { text-align: left; border: 1px dotted black; width: 50%; } /*右对齐*/ .right { text-...
    CSS各种对齐代码,左对齐、右对齐、中间对齐、底部对齐、两端对齐等,代码简单


     
    /*CSS代码:*/
    /*左对齐*/
    .left {
            text-align: left;
            border: 1px dotted black;
            width: 50%;
    }
    /*右对齐*/
    .right {
            text-align: right;
            border: 1px dotted black;
            width: 50%;
    }
    /*居中对齐*/
    .center {
            text-align: center;
            border: 1px dotted black;
            width: 50%;
    }
    /*两端对齐*/
    .justify {
            text-align: justify;
            border: 1px dotted black;
            width: 50%;
    }
    
    
    
    /*css3将一个div水平和垂直居中显示*/
    
    .div1{
    
        width: 100px;
        height: 100px;
        border: 4px solid red;
        position: absolute;
    
        text-align: center;
    
        left:0;
        right:0;
        top: 0;
        bottom: 0;
        margin: auto;
        /*50%为自身尺寸的一半*/
    }

     
    展开全文
  • 中间对齐方式四路PWM信号输出
  • stm32定时器时钟以及中间对齐模式

    千次阅读 2019-05-27 11:58:54
    现在用的较多的是SVPWM(SVPWM的具体原理会在后面另写一篇博客说明),要想产生SVPWM波形,需要控制的三相电压呈如下形式,即A、B、C三相的电压是中间对齐的,这就需要用到stm32定时器的中间对齐模式了。 1、stm...

    在永磁同步电机的控制中,需要对电机的三相定子施加一定的电压,才能控制电机转动。现在用的较多的是SVPWM(SVPWM的具体原理会在后面另写一篇博客说明),要想产生SVPWM波形,需要控制的三相电压呈如下形式,即A、B、C三相的电压是中间对齐的,这就需要用到stm32定时器的中间对齐模式了。

    1、stm32的时钟树

    stm32的时钟树如下图所示,简单介绍一下stm32时钟的配置过程。以外部时钟作为时钟源为例。HSE代表外部时钟(假设为8M)、SYSCLK为系统时钟,经过倍频器之后变成168M、SYSCLK经过AHB预分频器(假设分频系数为1)后变成HCLK时钟等于系统时钟SYSCLKHCLK即AHB外部总线时钟,经过APB预分频器分出APB1时钟(分频系数为2,低速设备SYSCLK/4)与APB2时钟(分频系数为1,高速设备SYSCLK/2

    HSE->SYSCLK->HCLK->APB1、APB2。

     针对stm32f427的配置源码如下

    复制代码

    
     

    复制代码

    2、stm32定时器的时钟

     stm32定时器分为高级定时器(TIM1与TIM8)、通用定时器(TIM2-TIM5、TIM9-TIM14)、基本定时器(TIM6、TIM7)。不同的定时器使用不同的时钟。

    其中TIM1、TIM8、TIM10、TIM11使用的是APB2时钟,而其余定时器使用的是APB1时钟。

    在stm32手册中有这么一段话

     根据前面RCC配置可以知道TIM1、TIM8、TIM10、TIM11使用的时钟频率为SYSCLK,其他定时器使用的时钟频率为SYSCLK/2

    3、stm32定时器1的中间对齐模式

    对齐模式的图示如下图所示,可以看到在中心对齐模式下产生的PWM波形的周期比实际计数周期要大1倍,所以假设要使用中间对齐模式,并且需要产生的PWM波频率为20K,那么对应的定时器时基应该设为40K。

    在SVPWM波的产生过程中使用的是定时器1的3对互补的PWM通道,它的配置如下

    static void SetSysClock(void)
    {
    #if defined (STM32F40_41xxx) || defined (STM32F427_437xx) || defined (STM32F429_439xx) || defined (STM32F401xx)
    /******************************************************************************/
    /*            PLL (clocked by HSE) used as System clock source                */
    /******************************************************************************/
      __IO uint32_t StartUpCounter = 0, HSEStatus = 0;
      
      /* Enable HSE */
      RCC->CR |= ((uint32_t)RCC_CR_HSEON);
     
      /* Wait till HSE is ready and if Time out is reached exit */
      do
      {
        HSEStatus = RCC->CR & RCC_CR_HSERDY;
        StartUpCounter++;
      } while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
    
      if ((RCC->CR & RCC_CR_HSERDY) != RESET)
      {
        HSEStatus = (uint32_t)0x01;
      }
      else
      {
        HSEStatus = (uint32_t)0x00;
      }
    
      if (HSEStatus == (uint32_t)0x01)
      {
        /* Select regulator voltage output Scale 1 mode */
        RCC->APB1ENR |= RCC_APB1ENR_PWREN;
        PWR->CR |= PWR_CR_VOS;
    
        /* HCLK = SYSCLK / 1*/
        RCC->CFGR |= RCC_CFGR_HPRE_DIV1;//AHB时钟  
    
    #if defined (STM32F40_41xxx) || defined (STM32F427_437xx) || defined (STM32F429_439xx)      
        /* PCLK2 = HCLK / 2*/
        RCC->CFGR |= RCC_CFGR_PPRE2_DIV2;//APB2时钟
        
        /* PCLK1 = HCLK / 4*/
        RCC->CFGR |= RCC_CFGR_PPRE1_DIV4;//APB1时钟
    #endif /* STM32F40_41xxx || STM32F427_437x || STM32F429_439xx */
    
       
        /* Configure the main PLL */
        RCC->PLLCFGR = PLL_M | (PLL_N << 6) | (((PLL_P >> 1) -1) << 16) |
                       (RCC_PLLCFGR_PLLSRC_HSE) | (PLL_Q << 24);
    
        /* Enable the main PLL */
        RCC->CR |= RCC_CR_PLLON;
    
        /* Wait till the main PLL is ready */
        while((RCC->CR & RCC_CR_PLLRDY) == 0)
        {
        }
       
    #if defined (STM32F427_437xx) || defined (STM32F429_439xx)
        /* Enable the Over-drive to extend the clock frequency to 180 Mhz */
        PWR->CR |= PWR_CR_ODEN;
        while((PWR->CSR & PWR_CSR_ODRDY) == 0)
        {
        }
        PWR->CR |= PWR_CR_ODSWEN;
        while((PWR->CSR & PWR_CSR_ODSWRDY) == 0)
        {
        }      
        /* Configure Flash prefetch, Instruction cache, Data cache and wait state */
        FLASH->ACR = FLASH_ACR_PRFTEN | FLASH_ACR_ICEN |FLASH_ACR_DCEN |FLASH_ACR_LATENCY_5WS;
    #endif /* STM32F427_437x || STM32F429_439xx  */
    
    
        /* Select the main PLL as system clock source */
        RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
        RCC->CFGR |= RCC_CFGR_SW_PLL;
    
        /* Wait till the main PLL is used as system clock source */
        while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS ) != RCC_CFGR_SWS_PLL);
        {
        }
      }
      else
      { /* If HSE fails to start-up, the application will have wrong clock
             configuration. User can add here some code to deal with this error */
      }
    }

    复制代码

    static void TIM1_Configuration(void)
    {    
        TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
        TIM_OCInitTypeDef  TIM_OCInitStructure;
        TIM_BDTRInitTypeDef TIM_BDTRInitStructure;
        
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);//使能定时器1时钟
        
        Time1_Period =  (SystemCoreClock / 40000 );//定时器频率为APB2频率的2倍=HCLK 自动重装载为40K,最大值为4200
        
        Limit_Pluse_Max_Value = Time1_Period * 0.95;
        
      /* TIM1 Peripheral Configuration */ 
        
      TIM_DeInit(TIM1);
    
      /* Time Base configuration */
        //配置定时器的计数方式为中间对齐方式,所以产生的PWM波的频率为20K
      TIM_TimeBaseStructure.TIM_Prescaler = 0x0;
      TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned1;//TIM_CounterMode_Up;TIM_CounterMode_CenterAligned1
      TIM_TimeBaseStructure.TIM_Period = Time1_Period - 1;//PERIOD;//定时器时基40K
      TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;
      TIM_TimeBaseStructure.TIM_RepetitionCounter = 0x0;
    
      TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure);
    
      /* Channel 1, 2,3 and 4 Configuration in PWM mode */
      TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; 
      TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; 
      TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;                  
      TIM_OCInitStructure.TIM_Pulse = Time1_Period / 2;//CCR1_Val; //占空比50%
      TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;//TIM_OCPolarity_Low;TIM_OCPolarity_High;
      TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;//TIM_OCNPolarity_Low;TIM_OCNPolarity_High;         
      TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;//TIM_OCIdleState_Set;
      TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
        
      TIM_OC1Init(TIM1,&TIM_OCInitStructure); 
    
      TIM_OCInitStructure.TIM_Pulse = Time1_Period / 2;//CCR2_Val;//占空比50%
      TIM_OC2Init(TIM1,&TIM_OCInitStructure);
    
      TIM_OCInitStructure.TIM_Pulse = Time1_Period / 2;//CCR3_Val;//占空比50%
      TIM_OC3Init(TIM1,&TIM_OCInitStructure);
        
        
    //   /* Channel 4 Configuration in OC */
    //   TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
    //   TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    //   TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;
    //   TIM_OCInitStructure.TIM_Pulse = 4000;//Time1_Period / 2;            //1500;//PERIOD - 1; 
    //   
    //   TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; 
    //   TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low;         
    //   TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
    //   TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;            
      
    //   TIM_OC4Init(TIM1,&TIM_OCInitStructure);    
        
        /* TIMx->CCMR1的bit3设为1:输出比较寄存器预装载使能 */  // PWM占空比改变只在更新事件时生效
      TIM_OC1PreloadConfig(TIM1,TIM_OCPreload_Enable);//A相
        
        /* TIMx->CCMR1的bit11设为1:输出比较寄存器预装载使能 */ // PWM占空比改变只在更新事件时生效
      TIM_OC2PreloadConfig(TIM1,TIM_OCPreload_Enable);//B相
        
        /* TIMx->CCMR2的bit3设为1:输出比较寄存器预装载使能 */  // PWM占空比改变只在更新事件时生效
      TIM_OC3PreloadConfig(TIM1,TIM_OCPreload_Enable);//C相
    
    //   TIM_OC4PreloadConfig(TIM1,TIM_OCPreload_Enable);//电磁铁
        
      /* Automatic Output enable, Break, dead time and lock configuration*/
      TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
      TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
      TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1; 
      TIM_BDTRInitStructure.TIM_DeadTime = 50;
      TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;//TIM_Break_Enable;
      TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
      TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Disable;//TIM_AutomaticOutput_Enable;
    
      TIM_BDTRConfig(TIM1,&TIM_BDTRInitStructure);
        
        TIM_SelectOutputTrigger(TIM1,TIM_TRGOSource_Update);
        
      /* TIM1 counter enable */
    //   TIM_Cmd(TIM1,ENABLE);
    
      /* Main Output Enable */
       TIM_CtrlPWMOutputs(TIM1,ENABLE);//由于使用中间对齐模式,PWM频率为20K
        
      //TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE);//定时器1的溢出中断
    }

     

    展开全文
  • 每次看一下android编程都是浏览一下文档,Setup下开发环境,跑个Hello World 就以为自己会啦,这样不行啊!下决心踏踏实实学习一下android编程,UI都调不 ...屏幕中间对齐: 比较LinerLayout与...

    每次看一下android编程都是浏览一下文档,Setup下开发环境,跑个Hello World

    就以为自己会啦,这样不行啊!下决心踏踏实实学习一下android编程,UI都调不

    好,所以还要拒绝浮躁,认认真真的学习,顺便记录一下学习的历程。

    屏幕中间对齐

    比较LinerLayout与RelativeLayout中如何实现组件中间对齐的方法,演示程序

    LinerLayout中要实现组件中间对齐,必须设置

    android:gravity="center"
    完整的xml配置如下:

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    	android:orientation="vertical" 
    	android:gravity="center"
    	android:layout_width="fill_parent"
    	android:layout_height="fill_parent" 
    	android:background="#FFFFFF">
    	<TextView android:layout_width="wrap_content"
    		android:layout_height="wrap_content"
    		android:textColor="@color/black" 
    		android:text="@string/hello" />
    		
    	<Button android:text="Test Me" 
    		android:id="@+id/button1"
    		android:textColor="@color/black"
    		android:layout_width="wrap_content" 
    		android:layout_height="wrap_content">
    	</Button>
    </LinearLayout>
    RelativeLayout中要实现多个组件的中间对齐,组件必须设置

    android:layout_centerInParent="true"

    完整的xml配置如下:

    <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="#FFFFFF">
        <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    		android:orientation="vertical" 
    		android:gravity="center"
    		android:layout_centerInParent="true"
    		android:layout_width="wrap_content"
    		android:layout_height="wrap_content" 
    		android:background="#FFFFFF">
    	    <Button
    	        android:id="@+id/button1"
    	        android:layout_width="wrap_content"
    	        android:layout_height="wrap_content"
    	        android:layout_margin="5dp"
    	        android:text="Test Button1"
    	        style="@style/btnStyleBeige"/>
    	    <Button
    			android:id="@+id/button2"
    			android:layout_width="wrap_content"
    			android:layout_height="wrap_content"
    			android:layout_margin="5dp"
    			android:text="Test Button2"
    			style="@style/btnStyleBeige"/>
    	</LinearLayout>
    </RelativeLayout>

    转载于:https://my.oschina.net/abcijkxyz/blog/721336

    展开全文
  • html css 怎么使img和a标签在一个行内元素中间对齐 答案是:#box ul.games li img{vertical-align: middle;} 这行很重要哦。 ? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 ...
    
    html css 怎么使img和a标签在一个行内元素中间对齐

    答案是:#box ul.games li img{vertical-align: middle;} 这行很重要哦。

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30
    31
    32
    33
    34
    35
    36
    37
    38
    39
    40
    41
    42
    43
    44
    45
    46
    47
    48
    49
    50
    51
    52
    53
    <div id="box">
    <div class="div01">
       <div class="border"><img src="../images/top_06.gif"></div>
        
        <ul class="content01 black">
                <li class="clearfix"><ul class="gtype"><strong>  角色扮演:</strong></ul>
                        <ul class="games clearfix">
                        <li><img src="./images/smallgameicon/game_70.png"><a href="#" target="_blank">无上神兵</a></li>
                        <li><img src="./images/smallgameicon/game_72.png"><a href="#" target="_blank">九鼎记</a></li>
                        <li><img src="./images/smallgameicon/game_23.png"><a href="#" target="_blank" style="color:#f00;">神仙道</a></li>
                        <li><img src="./images/smallgameicon/game_56.png"><a href="#" target="_blank">女神联盟</a></li>
                        <li><img src="./images/smallgameicon/game_39.png"><a href="#" target="_blank">三国演义</a></li>
                        <li><img src="./images/smallgameicon/game_71.png"><a href="#" target="_blank">热血街机</a></li>
                        <li><img src="./images/smallgameicon/game_65.png"><a href="#" target="_blank">热血屠龙</a></li>
                        <li><img src="./images/smallgameicon/game_64.png"><a href="#" target="_blank">魅影传说</a></li>
                        <li><img src="./images/smallgameicon/game_25.png"><a href="#" target="_blank">盛世三国</a></li>
                        <li><img src="./images/smallgameicon/game_32.png"><a href="#" target="_blank">瑞星龙将</a></li>
                        <li><img src="./images/smallgameicon/game_34.png"><a href="#" target="_blank">梦幻飞仙</a></li>
                        <li><img src="./images/smallgameicon/game_63.png"><a href="#" target="_blank">深渊</a></li>
                        <li><img src="./images/smallgameicon/game_36.png"><a href="#" target="_blank">热血海贼王</a></li>
                        <li><img src="./images/smallgameicon/game_40.png"><a href="#" target="_blank">开天辟地</a></li>
                        <li><img src="./images/smallgameicon/game_42.png"><a href="#" target="_blank">秦美人</a></li>
                        <li><img src="./images/smallgameicon/game_16.jpg"><a href="#" target="_blank">凡人修真</a></li>
                        <li><img src="./images/smallgameicon/game_43.png"><a href="#" target="_blank">大侠传</a></li>
                        <li><img src="./images/smallgameicon/game_58.png"><a href="#" target="_blank">剑影</a></li>
                        <li><img src="./images/smallgameicon/game_41.png"><a href="#" target="_blank">仙落凡尘</a></li>
                        <li><img src="./images/smallgameicon/game_66.png"><a href="#" target="_blank">雷霆之怒</a></li>
                        </ul>
                </li>
                <li class="clearfix"><ul class="gtype"><strong>  战争策略:</strong></ul>
     
                        <ul class="games clearfix">
                        <li><img src="./images/smallgameicon/game_70.png"><a href="#" target="_blank">无上神兵</a></li>
                        <li><img src="./images/smallgameicon/game_72.png"><a href="#" target="_blank">九鼎记</a></li>
                        <li><img src="./images/smallgameicon/game_23.png"><a href="#" target="_blank" style="color:#f00;">神仙道</a></li>
                        </ul>
     
                </li>
     
                <li class="clearfix"><ul class="gtype"><strong>  休闲竞技:</strong></ul>
     
                        <ul class="games clearfix">
                        <li><img src="./images/smallgameicon/game_70.png"><a href="#" target="_blank">无上神兵</a></li>
                        <li><img src="./images/smallgameicon/game_72.png"><a href="#" target="_blank">九鼎记</a></li>
                        <li><img src="./images/smallgameicon/game_23.png"><a href="#" target="_blank" style="color:#f00;">神仙道</a></li>
                        </ul>
     
                </li>
        </ul>
        
       <div class="border"><img src="../images/top_07.gif"></div>
    </div>
    </div>

      

    复制代码
    .top_bj{ width:100%; height:36px; overflow:hidden; background:url(../images/top_bj.gif);}
    .top_content{ width:100%; margin:0px auto; height:36px; overflow:hidden;}
    .top_logo{ width:170px; float:left;}
    .all_icon{float:left; padding:7px; width:16px; height:16px; overflow:hidden;}
    .all_black,.all_black a:link,.all_black a:visited{font-size: 12px; line-height:30px; font-weight: normal; color: #595959; text-decoration: none; font-family:Arial, Helvetica, sans-serif;}
    .all_black a:hover{font-size: 12px; line-height:30px; font-weight: normal; color: #0e6cb0; text-decoration: none; font-family:Arial, Helvetica, sans-serif;}
    .black,.black a:link,.black a:visited{font-size:12px;line-height: 36px;font-weight: normal;color: #464646;text-decoration: none; font-family:Arial, Helvetica, sans-serif;}
    .black a:hover{font-size:12px;line-height: 36px;font-weight: normal;color: #03C;text-decoration: none; font-family:Arial, Helvetica, sans-serif;}
    
    .red,.red a:link,.red a:visited{font-size:12px;line-height: 36px;font-weight: normal;color: #F00;text-decoration: none; font-family:Arial, Helvetica, sans-serif;}
    .red a:hover{font-size:12px;line-height: 36px;font-weight: normal;color: #03C;text-decoration: none; font-family:Arial, Helvetica, sans-serif;}
    
    #box{display:none;width:593px; float:right; overflow:hidden; margin:0px auto; padding-right:100px;}
    #box .div01{width:593px; overflow: hidden; position:absolute; z-index:999; top:30px;}
    #box .div01 .border{width:100%; overflow:hidden;}
    #box ul.content01{width:591px; background:#FFF; overflow: hidden; border:solid 1px #9c9c9c; border-bottom:none;border-top:none;list-style:none;}
    #box ul.gtype{float: left; width: 80px;}
    #box ul.games{float: left; width: 509px;}
    #box ul.games li{float: left; width: 100px;}
    #box ul.games li img{vertical-align: middle;}
    #box ul.games li a{padding-left: 5px;}
    复制代码

    展开全文
  • 表单中input中间对齐

    千次阅读 2017-06-09 21:44:24
    SD css表单对齐解决方案 body{font:12px/1.5 Tahoma;} h1{padding:10px 0; margin-bottom:10px; color:#666; border-bottom:1px solid #ccc; font-size:12px;} .con{color:#666; padding:10px 20px; background...
  • .h文件 #import typedef enum {  VerticalAlignmentTop,  VertiaclAlignmentBottom,  VerticalAlignmentMiddle   }VerticalAlignment; @interface MyLable :
  • echarts中可以写个辅助bar “顶起来”var data = [2900, 1000, 1400, 1200, 300, 230]function iData (data) {let max = Math.max.apply(null,data)console.log(max)let iData = data.map((item) =>...
  • 它就相对于容器中间对齐了。别的我没试过。反正都有办法对齐。其他对齐各浏览器有差异,得分开测试。margin:0 auto; 就能居中了,当然,你本层宽度要小于上一层才能看到效果。有时候,必须定义width, margin:0 auto;...
  • <table> <tr> <td>...(貌似image1的底部是和text1的中间对齐的,如果将两个元素分别放到不同的TD,垂直对齐样式就又起作用了!)。 按照上面的写法,使用CSS怎么设置对齐?
  • 我经常看到有人说margin-left和margin-right设置为auto就能水平方向中间对齐。 或者设置center里面的内容就能对齐。 能给我解释解释margin-left和margin-right设置为auto,align设置为center和center标签的水平方向...
  • 在日常开发中,经常会使用到图片与文字或图片与按钮对齐。1.图片与按钮 处于同一行,并居中对齐,长使用的方法如下:按钮使用属性 vertical-algin:middle 使元素的基线与父元素的基线对齐。以下部分,借鉴于以下bolg...
  •  在日常开发中,经常会使用到图片与文字或图片与按钮对齐。    1.图片与按钮 处于同一行,并居中对齐,长使用的方法如下:   src="" style="vertical-align:middle"/>   type="button">按钮 ...
  • 效果如图: [img=... 我的疑问是:是不是UL在不做任何属性设置的情况下有一个padding-left值呢?这个值是多少呢?另外延伸一下,是不是每个元素都有一些属性的默认值呢?
  • align=absmiddle表示图像的中间与同一行中最大元素的中间对齐AbsBottom 图像的下边缘与同一行中最大元素的下边缘对齐。AbsMiddle 图像的中间与同一行中最大元素的中间对齐。Baseline 图像的下边缘与第一行文本的下边...
  • wps有时候居中对齐不是在中间wps文字设置居中对齐的方法:步骤一:打开WPS文字编辑器。步骤二:在WPS文本框输入一段文字做为实例,例如“百度分享”。步骤三:将光标移动到需要居中的文字,然后按快捷键“Ctrl+E”,...
  • word使文字在页面中间对齐

    千次阅读 2017-07-28 10:49:00
    word使文字在页面中间对齐选择视图–&gt;标尺,鼠标移到标尺两个相向三角形中间(图中红圈中间)变成双向箭头后,拖动到你想要的位置
  • 一般场合下是使用边沿对齐; 特殊的场合使用中间对齐,比如电机控制,BLDC, FOC最好用中间对齐加死区互补。
  • // 设置文本的中间线与 label 的中间线对齐,但是必须是行数为1的时候才起作用  _movieLabel.baselineAdjustment = UIBaselineAdjustmentAlignCenters;

空空如也

空空如也

1 2 3 4 5 ... 20
收藏数 1,906
精华内容 762
关键字:

中间对齐