在此插入代码

if(s.length === 1){return (s.charAt(0)-'0')};
var arr = [];
for(var i = 0 ; i < s.length ; i ++){
    arr.push(s.charAt(i));
}
return arr.reduce(function(x,y){
    console.log("x="+x+",y="+y);
    return (x-'0')*10+(y-'0');
});