過去，當有一個陣列的內容需要依序取值時，都會使用for... 迴圈(for loop)的形式將值一一取出，原始碼的結構如下：var array = ['小明', '杰倫', ... ... <看更多>

The for...in loop iterates over the enumerable properties of an object. It also goes up to the prototype chain and enumerates over inherited properties. · Avoid ... ... <看更多>

Some JS frameworks, like Prototype modifies the Array prototype. ... If you care about order, be explicit about it and use a regular for loop with an index. ... <看更多>