我的代码来了

TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;//定义定时器结构体
TIM_OCInitTypeDef  TIM_OCInitStructure;//定义PWM结构体
TIM_BDTRInitTypeDef TIM_BDTRInitStructure; //死区时间结构体
GPIO_InitTypeDef GPIO_InitStructure; //定义GPIO结构体

//使能时钟TIM1 GPIOA GPIOB AFIO
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO|RCC_APB2Periph_TIM1|RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB,ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_9|GPIO_Pin_10|GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);//初始化 GPIPA8，9，10，11复用推挽输出

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;
GPIO_Init(GPIOB,&GPIO_InitStructure); //初始化GPIOB13,14，15复用推挽输出

//TIM_DeInit(TIM1);

TIM_TimeBaseStructure.TIM_Period = arr;
TIM_TimeBaseStructure.TIM_Prescaler = psc;
TIM_TimeBaseStructure.TIM_CounterMode =TIM_CounterMode_Up ;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure);

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High ; //高电平为有效电平
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //输出使能
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High ;//互补输出，高电平为有效电平
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;//互补输出使能
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;//CR2寄存器 这里没用到，不知道干嘛用的 0x0000；
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;//CR2寄存器，这里没用到，reset的值是=0x0000；
TIM_OCInitStructure.TIM_Pulse =  300;                      //设置占空比
    TIM_OC1Init(TIM1,&TIM_OCInitStructure);   //初始化 CH1 CHN1通道；占空比30%

TIM_OCInitStructure.TIM_Pulse = 405;
TIM_OC2Init(TIM1,&TIM_OCInitStructure);   //初始化 CH2 CHN2通道；占空比45%

TIM_OCInitStructure.TIM_Pulse = 450;
TIM_OC3Init(TIM1,&TIM_OCInitStructure);  // 初始化 CH3 CHN3通道；占空比50%

TIM_OCInitStructure.TIM_Pulse = 600 ;
TIM_OC4Init(TIM1,&TIM_OCInitStructure);  //初始化  CH4通道     ；占空比60%

TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Disable ;
TIM_BDTRInitStructure.TIM_Break =  TIM_Break_Disable;
TIM_BDTRInitStructure.TIM_DeadTime = 0x14;
TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF; //锁定关闭
TIM_BDTRInitStructure.TIM_OSSIState =  TIM_OSSIState_Disable; //
TIM_BDTRInitStructure.TIM_OSSRState =  TIM_OSSRState_Disable; //
TIM_BDTRConfig(TIM1,&TIM_BDTRInitStructure);  //设置死区时间2MS
//  TIM_OC1PreloadConfig(TIM1,TIM_OCPreload_Enable);
// TIM_OC2PreloadConfig(TIM1,TIM_OCPreload_Enable);
// TIM_OC3PreloadConfig(TIM1,TIM_OCPreload_Enable);
TIM_CtrlPWMOutputs(TIM1,ENABLE);        //使能外设 TIM1 的主输出

TIM_ARRPreloadConfig(TIM1,ENABLE);    //自动重装载使能
TIM_Cmd(TIM1,ENABLE);                //时钟使能