首頁 > 開發者 > JavaScript
JS for...in 遍曆語句用法執行個體分析，for...in執行個體分析
本文執行個體講述了JS for...in 遍曆語句用法。分享給大家供大家參考，具體如下：
for...in 語句用於對數組或者對象的屬性進行迴圈操作。
for (變數 in 對象)
{
在此執行代碼
}
這裡的“變數”用來指定變數，指定的變數可以是數組元素，也可以是對象的屬性。
舉個例子：
<!DOCTYPE html><meta charset="UTF-8"><script>var x;var zoon = new Array();zoon[0] = "貓貓";zoon[1] = "狗狗";zoon[2] = "豬豬";for (x in zoon){ console.log(zoon[x]);}var student={};student.name="張三";student["age"]=20;for(var i in student)//前面變數i就是對象的屬性名稱{ console.log(i);//name age console.log(student[i]);//張三 20}</script>
運行如下：
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
