JavaScript-03-常见函数

 func 函数名() {
  //函数体
 }

    <script text="text/javascript">
        //1.1加法运算(两个数)
        function sum(num1, num2) {
            return num1 + num2;
        }

        //如何调用
        var result = sum(100,200);
        console.log(result);
    </script>

    <script text="text/javascript">
        //1.2万能的加法函数(传入数组)
        function sumAll(numbers) {
            //定义一个变量
            var  result = 0;
            for (var i in  numbers){
                  result += numbers[i];
            }
            return result;
        }
        var resultA = sumAll([200,100,20,50]);
        console.log(resultA);
    </script>

    <script text="text/javascript">
        //1.3匿名函数
        var res =  function () {
            console.log(‘我是匿名函数‘);
        }
        //调用匿名函数
        res();
    </script>