请写出计算10～30的整数和的javascript函数，并给出该函数的调用方法。

请写出计算10～30的整数和的javascript函数，并给出该函数的调用方法。

<script type ="text/javascript">        function getSum(begin, end) {           var sum = 0;            for (var i = begin; i <= end; i++) {                sum = sum + i;          }           return sum;     }       function show() {           document.getElementById("textbox").value = getSum(10, 30);      }   </script>

 function foo()
{
var sum = 0;
for (var i = 10; i <= 30; i++) sum+=i;
rwturn sum;
}
调用
alert(foo());

function foo()
{
var sum = 0;
for (var i = 10; i <= 30; i++) sum+=i;
return sum;
}
//按f12看输出结果
console.log(foo())

function foo()
{
var sum = 0;
for (var i = 10; i <= 30; i++) sum+=i;
return sum;
}
//按f12看输出结果
console.log(foo()

function foo()
{
var sum = 0;
for (var i = 10; i <= 30; i++) sum+=i;
rwturn sum;
}
调用
alert(foo());

function foo()
{
var sum = 0;
for (var i = 10; i <= 30; i++) sum+=i;
return sum;
}
//按f12看输出结果
console.log(foo()