英文字母有多少？ | JavaScript 程式專案

{"id":196516,"student_id":1874,"content":"var a=\"\";\nvar e=0;\nvar arr=a.split('');\nvar apt=['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'];\nfor (var i = 0; i \u003c apt.length; i++) {\n    for (var u = 0; u \u003c arr.length; u++) {\n        if (a[u]==apt[i]) {\n            e+=1;\n        }\n    }\n    s=apt[i]+':'+e;\n    e=0;\n    console.log(s);\n}\n\n//var a='ksdfves';\n//var arr={};\n//var e=0;\n//for (var i = 0; i \u003c a.length; i++) {\n//    e+=1;\n//    arr[a[i]]=e;\n//    if (a[i]in arr==true) {\n//        \n//    }\n//}\n//console.log(arr);","created_at":"2020-10-17T18:08:50.844+08:00","updated_at":"2020-11-14T18:37:27.358+08:00","name":"英文字母有多少？","language":"javascript","screenshot":{"url":"https://cdn4.koding.school/uploads/project/screenshot/196516/fd1ac05835b665cf0d7e3c5532c7c2d7.jpg"},"parent_id":2,"plugin":"","description":null,"note":null,"status":"public","like_student_ids":[],"is_featured":false,"views":90,"hashid":"yeysvz4n8","is_content_changed":false,"review_status":"unsubmitted","submitted_at":null,"reviewed_at":null,"advise":null,"is_deleted":false}