1 //求任意个数的和
 2 function test() {
 3     var sum = 0;
 4     for (var i = 0; i < arguments.length; i++) {
 5         sum += arguments[i]
 6     };
 7     return sum;
 8 }
 9 
10 var ret = test(1,2,3,4);
11 console.log(ret);

 

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