4-10編程題怎么做的
怎么做?
MT_土豆
2017-03-03
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怎么做?
2017-03-03
舉報(bào)
2017-03-03
?var infos=[["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"]];
?
?//第一次篩選，找出都是大一的信息
?for (var i =0;i<infos.length;i++){
? ? ?if(infos[i][3] == "大一" && infos[i][1] == "女"){
? ? ? ? ?document.write(infos[i][0]+"<br/>");
? ? ?}
?}
??
2017-03-07
for (var i =0;i<infos.length;i++),var i = 0,這個(gè)循環(huán)的開(kāi)始值為0，對(duì)應(yīng)的就是這個(gè)infos二維數(shù)組中第一維數(shù)組的下標(biāo)（key），也就是infos[i],infos.length是infos二維數(shù)組中第一維的個(gè)數(shù)，之后就是循環(huán)遍歷每一個(gè)infos的以為數(shù)組！