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vue事件带默认参数,怎么传递其他参数

子组件emit出来的事件带有1到2个参数,在父组件中怎么传递其他参数,且保留子组件的参数,记得有2中方式,求教

子组件
this.$emit('submit', arg1, arg2)

父组件
<some-cmp @submit='doSomething'>确定</some-cmp>

doSomething后面怎么传参,除了接收arg1、arg2,再添加一个arg3


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@submit='(arg1, arg2) => doSomething(arg1,arg2, arg3)'

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