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console

// 计算1+2+3 ... +98+99+100的值
//1 .for循环
function forsum() {

    var result1 = 0;

    for (var i = 0; i <= 100; i++){
        result1 += i;
    }
    
    return result1;

}

var sum1 = forsum();

console.log(sum1)



// 2. do-while循环语句
function dwsum() {
    
    var result2 = 0;
    var i = 0;
    
    do {
        
        result2 += i;

        i++;

    }while (i <= 100);

    return result2;

}

var sum2 = dwsum();

console.log(sum2)


//3. while()循环

function whilesum() {

    var result3 = 0;
    var i = 0;

    while (i <= 100) {
        result3 += i;
        i++;
    }

    return result3;

}

var sum3 = whilesum();

console.log(sum3)

<!DOCTYPE html> 
<html>
<head>
    <meta charset="utf-8" />   
</head>
<body>

    <script>
    

    </script>
</body>
</html>