* Delete a property and trigger change if necessary.
(target, key)
| 902 | * Delete a property and trigger change if necessary. |
| 903 | */ |
| 904 | function del (target, key) { |
| 905 | if (Array.isArray(target) && typeof key === 'number') { |
| 906 | target.splice(key, 1); |
| 907 | return |
| 908 | } |
| 909 | var ob = (target ).__ob__; |
| 910 | if (target._isVue || (ob && ob.vmCount)) { |
| 911 | process.env.NODE_ENV !== 'production' && warn( |
| 912 | 'Avoid deleting properties on a Vue instance or its root $data ' + |
| 913 | '- just set it to null.' |
| 914 | ); |
| 915 | return |
| 916 | } |
| 917 | if (!hasOwn(target, key)) { |
| 918 | return |
| 919 | } |
| 920 | delete target[key]; |
| 921 | if (!ob) { |
| 922 | return |
| 923 | } |
| 924 | ob.dep.notify(); |
| 925 | } |
| 926 | |
| 927 | /** |
| 928 | * Collect dependencies on array elements when the array is touched, since |