js 删除对象属性的方法使用delete删除let a = {name:'张三',age:'24'}delete a.name//a = {age:'24'}将对应的属性值设为undefinedlet a = {name:'张三',age:'24'}a.name = undefined//a = {name:undefined,age:'24'}vue 中删除对象属性vue中直接使用delete删