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我的代码为什么不能输出呢？

var infor=[["小A","女",21,"大一"],["小B","男",23,"大三"],["小C","男",24,"大四"],["小D","女",21,"大一"],["小E","女",22,"大四"],["小F","男",21,"大一"],["小G","女",22,"大二"],["小H","女",20,"大三"],["小I","女",20,"大一"],["小J","男",20,"大三"]];

switch(infor[i][3]==="大一"&&infor[i][1]==="女"){

case true:

document.write("大一女生信息:"+infor[i]);

break;

}

慕粉1440489053

2017-02-28

源自：JavaScript进阶篇 4-10

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慕粉1844174621
2017-03-03

/*我也是最进才学的,这是我的方法你看行不行.
①你应该是像楼上说的没加for或其他循环语句;②且条件要一个个放,不然循环输出会出错,就不显示了;③下面是我多次修改的代码,让我们共同进步!:
*/

var infor=[
["小A","女",21,"大一"],["小B","男",23,"大三"],
["小C","男",24,"大四"],["小D","女",21,"大一"],
["小E","女",22,"大四"],["小F","男",21,"大一"],
["小G","女",22,"大二"],["小H","女",20,"大三"],
["小I","女",20,"大一"],["小J","男",20,"大三"]
];

document.write("<b>大一女生:</b><br/>");
for(var i=0;i<10;i++){
switch(infor[i][3]){
      case "大一":
             document.write("大一女生信息:"+infor[i]+"<br/>");
       break;

   }
}

document.write("<br/><b>女生姓名:</b><br/>");
for(var i=0;i<10;i++){

switch(infor[i][1]){
      case "女":
             document.write("大一女生信息:"+infor[i][0]+"<br/>");
       break;
   }
}