JS 循环语句处理

// 利用 JavaScript 语句进行标记，break跳出单层循环
function recycle0(){
    var result = "";
    result += "recycle0 循环语句标记break例子:" + "\n";
    out:
        for (i = 0; i < 10; i++){
            if (i == 3){
                break out; // 程序循环终止跳出循环
            }
            result += "数字：" + i + "\n";
        }
    console.log(result)
}
recycle0()

// 利用 break 跳出单层循环
function recycle1(){
    var result = "";
    result += "recycle1 循环break例子:" + "\n";
    for (i = 0; i < 10; i++){
        if (i == 3){
            break; // 程序循环终止跳出循环
        }
        result += "数字：" + i + "\n";
    }
    console.log(result)
}
recycle1()

//利用break跳出单层循环
function recycle2(){
    var result = "";
    result += "recycle2 循环 return 例子:" + "\n";
    console.log(result)
    for (i = 0; i < 10; i++){
        if (i==3){
            return; // 程序循环终止跳出循环
        }
        result= "数字：" + i + "\n";
        console.log(result)
    }

}
recycle2()

// 利用 continue 绕过条件继续循环
function recycle3(){
    var result = "";
    result+="recycle3 循环 continue 例子:" + "\n";
    for (i = 0; i < 10; i++){
        if (i == 3){
            continue; // 绕过条件，继续循环
        }
        result += "数字：" + i + "\n";
    }
    console.log(result)
}
recycle3()

// 利用 continue 绕过条件继续循环
function recycle4(){
    var result = "";
    result += "recycle4 循环语句标记 continue 例子:" + "\n";
    out:
        for (i = 0; i < 10; i++){
            if (i == 3){
                continue out; // 绕过条件，继续循环
            }
            result += "数字：" + i + "\n";
        }
    console.log(result)
}
recycle4()


// 利用 while 循环
function recycle5(){
    var result = "";
    result+="recycle5 while 循环break例子:" + "\n";
    var i = 0;
    while(i < 10){
        if (i == 3){
            break;
        }
        result += "数字：" + i + "\n";
        i = i + 1
    }
    console.log(result)
}
recycle5()

// while循环（先判断，后执行）
function recycle6(){
    var result = "";
    result += "recycle6 while循环绕过条件的例子:" + "\n";
    var i = 0;
    while(i < 10){
        if (i != 3){
            result += "数字：" + i + "\n";
        }
        i = i + 1
    }
    console.log(result)
}
recycle6()

// do...while循环(先执行，后判断)
function recycle7(){
    var result = "";
    result += "recycle7 do..while循环绕过条件的例子:" + "\n";
    var i = 0;
    do{
        if (i != 3){
            result += "数字：" + i + "\n";
        }
        i = i + 1
    }
    while(i < 10)
    console.log(result)
}
recycle7()

// do...while循环(先执行，后判断)
function recycle8(){
    var result = "";
    result += "recycle8 do..while循环跳出循环的例子:" + "\n";
    var i = 0;
    do{
        if (i == 3){
            break;
        }
        result += "数字：" + i + "\n";
        i = i + 1
    }
    while(i < 10)
    console.log(result)
}
recycle8()


// 多重层循环
function recycle9(){
    var result = "";
    result+="recycle9 多重循环break例子:" + "\n";
    for (i = 0; i < 10; i++){
        for(j = 0; j < 10; j++){
            if (i == 3){
                break; // 程序跳出内层循环
            }
            result += "数字：(" + i + "-" + j + ")\n";
        }
    }
    console.log(result)
}
recycle9()

// 多重层循环
function recycle10(){
    var result = "";
    result += "recycle10 多重循环break例子:" + "\n";
    for (i = 0; i < 10; i++){
        for(j = 0; j < 10; j++){
            if (j == 3){
                break; // 程序跳出内层循环
            }
            result += "数字：(" + i + "-" + j + ")\n";
        }
    }
    console.log(result)
}
recycle10()

// 多重层循环
function recycle11(){
    var result = "";
    result += "recycle11 多重循环break例子:" + "\n";
    out:
        for (i = 0; i < 10; i++){
            for(j = 0; j < 10; j++){
                if (j == 3){
                    break out; // 程序跳出内层循环
                }
                result += "数字：(" + i + "-" + j + ")\n";
            }
        }
    console.log(result)
}
recycle11()

// 多重层循环
function recycle12(){
    var result = "";
    result += "recycle12 多重循环break例子:" + "\n";
    for (i = 0; i < 10; i++){
        if (i == 3){
            break; // 程序跳出内层循环
        }
        for(j = 0; j < 10; j++){
            result += "数字：(" + i + "-" + j + ")\n";
        }
    }
    console.log(result)
}
recycle12()

// 多重层循环
function recycle13(){
    var result = "";
    result += "recycle13 多重循环break例子:" + "\n";
    out:
        for (i = 0; i < 10; i++){
            for(j = 0; j < 10; j++){
                if (i == 3){
                    break out; // 程序跳出外层循环，循环终止
                }
                result += "数字：(" + i + "-" + j + ")\n";
            }
        }
    console.log(result)
}
recycle13()