'when using vue-router all things goes well but there always has error when I click the nav items?

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when i click nav items there has an error, but the application goes well!

            <a @click="$router.push({ name:'my' ,params:{username:'hello'}})">my music</a>
            <a @click="$router.push({ name:'part' ,query:{name:'xx'}})">friend</a>```
vue.jsvue-router


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