Vue made a lot of mistakes.

exactly what went wrong, it is not very clear


Update your node_modules.zip package, update to the latest version, and then extract it to your project. Try


where the .length attribute is used. It should be that the array needs to be initialized to [] for undefined, and the empty array


reports an error obviously., cannot read property 'length' of undefined
finds the data in the corresponding location to see if it is empty. Or there is no such field in the corresponding data at all. If it is possible, it may not be compatible

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