父组件对子组件传值source,子组件中用origin复制一份数据,如何让source和origin互不影响?

  props: {

    source: Array

  },

  computed: {

    origin: function () {

      var obj = {}

      obj = JSON.parse(JSON.stringify(this.source))

      return obj

    }

  },

当修改source时 ,origin也会修改

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