function sum(...rest) {
var x=0;
for(i=0;i<rest.length;i++)
{
x=x+rest[i];
}
return x;
function area_if_circle(r,pi)
if(arguments.length == 1)
pi=3.14;
if(arguments.length == 0)
console.log('请输入半径!');
else
return (pi*r*r);
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奶黄包丸子
function sum(...rest) {
var x=0;
for(i=0;i<rest.length;i++)
{
x=x+rest[i];
}
return x;
}
function area_if_circle(r,pi)
{
if(arguments.length == 1)
{
pi=3.14;
}
if(arguments.length == 0)
{
console.log('请输入半径!');
}
else
{
return (pi*r*r);
}
}