Question

我希望将随机打印的字符串分组为两组。

以下是用于随机化字符串的JavaScript代码：

Array.prototype.shuffle= function(times){
    var i,j,t,l=this.length;
    while(times--){
        with(Math){
            i=floor(random()*l);j=floor(random()*l);
        }
        t=this[i];this[i]=this[j];this[j]=t;
    }
    return this;
}

var players=["Ben","Caleb","Alex","Ryder","Brad","Garret","Justin","John","Kevin"]

document.write(players.shuffle(200).join("<BR>") )

显然，目前打印订单是

NAME 
NAME
NAME
NAME
NAME
NAME
NAME
NAME
NAME

但是我希望它是

NAME NAME
NAME NAME
NAME NAME
NAME NAME
NAME

我将如何做到这一点？

Answer 1

for(var i=1; i<players.length+1; i+=2){
    console.log(players[i-1]+" "+((players[i]!=undefined)?players[i]:""));
}

或

for(var i=0; i<players.length; i+=2){
    console.log(players[i]+" "+((players[i+1]!=undefined)?players[i]:""));
}

你可以这样使用它：

Array.prototype.shuffle= function(times){
    var i,j,t,l=this.length;
    while(times--){
        with(Math){
            i=floor(random()*l);j=floor(random()*l);
        }
        t=this[i];this[i]=this[j];this[j]=t;
    }
    return this;
}

var players=["Ben","Caleb","Alex","Ryder","Brad","Garret","Justin","John","Kevin"]
players.shuffle(200);

for(var i=0; i<players.length; i+=2){
    document.write(players[i]+" "+((players[i+1]!=undefined)?players[i+1]:"")+"<br>");
}

Answer 2

只是评论：

非常不喜欢带有的

，将在ECMAScript的未来版本中删除。它在这里使用是完全无偿的，考虑相当于：

i = Math.random() * l | 0; j = Math.random() * l | 0;

关于以二人方式打印成员，请考虑：

// Only increment by 1 in the condition for(var i=0, iLen=players.length; i<iLen; i++) { // Second increment is in here console.log(players[i] + " " + (++i in players? players[i] : '')); }

因此，当测试3 in players时，如果有3个项目（即索引0,1和2处的项目），它将返回false并且不会打印任何内容。

你也可以这样做：

console.log(players[i] + " " + (++i < iLen? players[i] : ''));

Answer 3

# first get your shuffled players
shuffled_players = players.shuffle(200)

# loop through them
for(var i=0; i<shuffled_players.length; i++){
  document.write(shuffled_players[i]);
  # put either a space or break
  document.write(i%2 == 0 ? " " : "<BR>");
}

将随机打印字符串分组成两组

3 个答案: