function sum(...rest) {
var s1=0;
if (arguments.length===0){console.log("请输入！")}
rest.forEach(function(a){
if(typeof(a)!=="number"){console.log(a+'不是数字');return 1}
s1=s1+a;
})
return s1
}
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那年今日34
function sum(...rest) {
var s1=0;
if (arguments.length===0){console.log("请输入！")}
rest.forEach(function(a){
if(typeof(a)!=="number"){console.log(a+'不是数字');return 1}
s1=s1+a;
})
return s1
}