选择 循环语句

//while循环
    
    /*var sum1 = 0;
    var i = 0;
    while(i <= 10){
        
        sum1 = sum1 + i;
        i = ++;    
    }
    alert(sum1);*/
    
    //do-while 循环
     
    
    /*var sum2 = 0;
    var i = 0;
    do{
        sum2= sum2 + i;
        i++;
        
    }while (i<= 10)
    alert(sum2);*/
    
    //for循环         for括号里的三个i条件是固定的格式
    
    
    /*var sum3 = 0;
    for(var i = 0;i <= 10; i++){
        sum3 = sum3 + i;
    }
    alert(sum3);*/
    
    
    
    //跳转语句 里面包含if语句
    
    //1 continue
    
    
    /*var sum = 0;
    for(var i = 0;i<= 10;i++){
        if(i == 9)/*注意等于是两个==
        {
            continue;
        }
        sum = sum + i;
        alert(i)
    }alert(sum)*/
    //跳过9,继续执行
    
    
    //2 break
    
    /*var sum = 0;
    for(var i=0;i<=10;i++){
        if(i==9){
            break;
        }//alert(i)
        sum = sum + i;
    }alert(sum)*/
    //执行到8,9后面的直接跳出