<script>//组合function C(arr, num){    var r=[];    (function f(t,a,n){        if (n==0) return r.push(t);        for (var i=0,l=a.length; i<=l-n; i++){            f(t.concat(a[i]), a.slice(i+1), n-1);        }    })([],arr,num);    return r;}//排列function A(arr, num){    var r=[];    (function f(t,a,n){        if (n==0) return r.push(t);        for (var i=0,l=a.length; i<l; i++){            f(t.concat(a[i]), a.slice(0,i).concat(a.slice(i+1)), n-1);        }    })([],arr,num);    return r;}var r1 = C("0123456789".split(""),3);document.write(‘组合：<ol><li>‘+r1.join(‘</li><li>‘)+‘</li></ol><br/><br/>‘);var r2 = A("0123456789".split(""),3);document.write(‘排列：<ol><li>‘+r2.join(‘</li><li>‘)+‘</li></ol>‘);</script>