JavaScript 的資料型態有七種-字串（string）、數字（number）、布林值（boolean）、null、undefined、物件（object）與symbol。 ... <看更多>

In JavaScript, an object is an unordered collection of key-value pairs. Each key-value pair is called a property. The key of a property can be a string and the ... ... <看更多>

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The most robust answer (i.e. that captures the intent of what you're trying to do while causing the fewest bugs) would be: Object.size = function(obj) { var ... ... <看更多>