title: Calling a function with a paramater in click causes error
body: <p>I have a computed Vue function that has a parameter. Every time I try to bind it to the click, I receive and error <code>Error in event handler for "click": "TypeError: searchHashtag is not a function"</code></p>
  
  <p>Here's the HTML:</p>
  
  <pre><code>&lt;el-button @click="searchHashtag('#acc')"&gt;Test&lt;/el-button&gt;
  </code></pre>
  
  <p>And here's the logic:</p>
  
  <pre><code>data () {
       messages: []
  },
  
  mounted () {
       api.fetchMessages( this.projectId, ( data ) =&gt; {
            this.messages = data.messages;
  },
  
  computed: {
       searchHashtag (searchBy) {
            if (_.contains(this.messages, searchBy))
                 this.$message('This is a message.');
       }
  }
  </code></pre>