Array.prototype.s0rt=function(){
    if(this.length<2){
        return this.slice(0)
    }else{
        var l=[],r=[],mid=[this[0]]
        for(var i=1;i<this.length;i++){
            if(this[i]<mid[0]){
                l.push(this[i])
            }else{
                r.push(this[i])
            }
            return l.s0rt().concat(mid.concat(r.s0rt()))
        }
    }
}
var arr = ["c","a",1,2,5,4].s0rt();
console.log(arr)
我不懂...問題在哪?QQ