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我的代碼為什么不能輸出呢？

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進(jìn)階篇 4-10

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2 回答

慕粉1844174621
2017-03-03

/*我也是最進(jìn)才學(xué)的,這是我的方法你看行不行.
①你應(yīng)該是像樓上說(shuō)的沒(méi)加for或其他循環(huán)語(yǔ)句;②且條件要一個(gè)個(gè)放,不然循環(huán)輸出會(huì)出錯(cuò),就不顯示了;③下面是我多次修改的代碼,讓我們共同進(jìn)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;
???}
}