章節連結
為了讓自己更進入學習狀況，開始嘗試在 Lidemy 鋰學院 上的 JavaScript 課程。這篇文章主要內容為「迴圈」要如何使用。
重點概要和個人補充資料
可以開瀏覽器的 Devtool 來除錯：在指令中加入 debugger。
指令
do…while(條件)，同時可善用 continue, break 來進入下一圈或中斷迴圈
while：先判斷條件，再執行
for loop：for (初始值;終止條件;值的變化){迴圈要做的事情}
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| /*debugger 除錯用& do/while */ | |
| var i = 1 | |
| debugger | |
| do { | |
| console.log(i++) | |
| }while(i <= 100) | |
| console.log("Finished!") | |
| /*for loop 範例*/ | |
| var scores = [10,20,30,40,50] | |
| var sum = 0 | |
| var avg = 0 | |
| for (var i=0; i<scores.length; i++){ | |
| console.log(scores[i]) | |
| sum += scores[i] | |
| } | |
| avg = sum/scores.length | |
| console.log('Total score is '+ sum +'.') | |
| console.log('Average score is '+ avg+'.') | |
| /*function 範例*/ | |
| function array(min, max){ | |
| var result = [] | |
| for (var i = min; i<= max; i += 2){ | |
| result.push(i) | |
| } | |
| return result | |
| } | |
| console.log(array(1,20)) | |
| /*function 可以帶入 function*/ | |
| function change(array, trans){ | |
| var result = [] | |
| for(var i = 0; i<array.length; i++){ | |
| result.push(trans(array[i])) | |
| } | |
| return result | |
| } | |
| function linear(x){ | |
| return x*2+1 | |
| } | |
| console.log( | |
| change([1,2,3],linear) | |
| ) | |
| /*印出橫向的星號*/ | |
| function star(num){ | |
| var result = '' | |
| for (var i = 1; i <= num; i++){ | |
| result += '*' | |
| } | |
| return result | |
| } | |
| console.log(star(5)) | |
| /*.sort排序，數字由小到大*/ | |
| var arr = [ 3, 25, 4, 67] | |
| arr.sort(function(a,b){ | |
| if (a===b) return 0 | |
| if (b>a) return -1 /*負數不換位置*/ | |
| return 1 /*正數換位置*/ | |
| }) | |
| console.log(arr) |
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