| 13311 | |
| 13312 | //检查根约束 根节点不能是slot或者template标签，并且不能含有v-for 属性 |
| 13313 | function checkRootConstraints(el) { |
| 13314 | { |
| 13315 | if (el.tag === 'slot' || el.tag === 'template') { |
| 13316 | warnOnce( |
| 13317 | "Cannot use <" + (el.tag) + "> as component root element because it may " + |
| 13318 | 'contain multiple nodes.' |
| 13319 | ); |
| 13320 | } |
| 13321 | if (el.attrsMap.hasOwnProperty('v-for')) { |
| 13322 | warnOnce( |
| 13323 | 'Cannot use v-for on stateful component root element because ' + |
| 13324 | 'it renders multiple elements.' |
| 13325 | ); |
| 13326 | } |
| 13327 | } |
| 13328 | } |
| 13329 | |
| 13330 | // tree management |
| 13331 | if (!root) { |