| 2817 | |
| 2818 | //不存在的key 发出警告 |
| 2819 | var warnNonPresent = function (target, key) { |
| 2820 | warn( |
| 2821 | "Property or method \"" + key + "\" is not defined on the instance but " + |
| 2822 | 'referenced during render. Make sure that this property is reactive, ' + |
| 2823 | 'either in the data option, or for class-based components, by ' + |
| 2824 | 'initializing the property. ' + |
| 2825 | 'See: https://vuejs.org/v2/guide/reactivity.html#Declaring-Reactive-Properties.', |
| 2826 | target |
| 2827 | ); |
| 2828 | }; |
| 2829 | |
| 2830 | //判断 系统内置 函数有没有 es6的Proxy 代理对象api |
| 2831 | var hasProxy = |