js 删除对象的属性 funmore 2020-05-19 734 阅读1分钟 方法1 let obj ={ a:1, b:2, c:3 } delete obj.a delete obj['a'] 彻底删除key value 速度较慢 方法2 let obj ={ a:1, b:2, c:3 } obj.a =undefine 速度快 key还在 https://flaviocopes.com/how-to-remove-object-property-javascript/