function类型

tips:

函数是对象，函数名是指针

<script>var sum = function(num1,num2){return num1 + num2;};var sum1 = sum(2,3);//此处调用sum函数console.log(sum1);//5var sum1 = sum;//此处访问函数的指针，指向同一个函数console.log(sum1(2,3));//5</script>