javascript - 如何从javascript关联数组中删除对象？(How do I remove objects from a javascript associative array?)

Question

Suppose I have this code:(假设我有这个代码：)

var myArray = new Object(); myArray["firstname"] = "Bob"; myArray["lastname"] = "Smith"; myArray["age"] = 25; Now if I wanted to remove "lastname"?....is there some equivalent of(现在，如果我想删除“姓氏”？....是否有一些相当于)
myArray["lastname"].remove() ?(myArray["lastname"].remove() ？) (I need the element gone because the number of elements is important and I want to keep things clean.)(（我需要元素消失，因为元素的数量很重要，我想保持清洁。）)   ask by translate from so

Answer 1

Use the "delete" keyword in Javascript.(在Javascript中使用“delete”关键字。)

delete myArray["lastname"]; EDIT:(编辑：) In some JavaScript engine, the delete keyword might hurt performance as it will undo compile / JIT optimization.(在某些JavaScript引擎中，delete关键字可能会损害性能，因为它会撤消编译/ JIT优化。) http://www.html5rocks.com/en/tutorials/speed/v8/ http://www.smashingmagazine.com/2012/11/writing-fast-memory-efficient-javascript/(http://www.html5rocks.com/en/tutorials/speed/v8/ http://www.smashingmagazine.com/2012/11/writing-fast-memory-efficient-javascript/)