<script type="text/javascript">
//计算阶乘
function factorial(num){
var result = 1;
for(var i = 1; i<=num; i++){
result *=i;
}
return result;
}
//计算1!+...+10!
function sum(){
var sum = 0;
for(var i=1; i<=10; i++){
sum +=factorial(i);
}
return sum;
}
</script>
追问没有输出啊
追答加到html文件里,点击calculate调用,返回值用alert()显示,如下:
test.html
<!DOCTYPE html>
<html>
<head>
<title></title>
<script type="text/javascript">
//计算阶乘
function factorial(num){
var result = 1;
for(var i = 1; i<=num; i++){
result *=i;
}
return result;
}
//计算1!+...+10!
function sum(){
var sum = 0;
for(var i=1; i<=10; i++){
sum +=factorial(i);
}
alert(sum);
}
</script>
</head>
<body>
<button onclick="sum()">calculate</button>
</body>
</html>
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