javascript - 如何从对象中删除未定义的属性？

Question

我有这个对象:

  this.prepaidObject = {
            'customerType' : this.prepaidDetailForm.prepaidDetails.customerType,
            'firstName' : this.prepaidDetailForm.prepaidDetails.firstName,
            'lastName' : this.prepaidDetailForm.prepaidDetails.lastName,
            'note' : this.prepaidDetailForm.prepaidDetails.note,
            'created': this.prepaidDetailForm.prepaidDetails.created
        };

现在有时某些属性是未定义的。我想要的是，如果 this.prepaidDetailForm.prepaidDetails 属性之一未定义，则不显示它们。因此，例如，如果 this.prepaidDetailForm.prepaidDetails.firsName 未定义，我不需要在对象中创建 'firstName' 属性。有什么建议我该怎么做吗？

Answer 1

检查您的对象:

    for( var m in this.prepaidObject ) {
        if ( this.prepaidObject[m] == undefined ) {
            delete this.prepaidObject[m];
        }
    }