npm install clipboard --save

<template>
  <div>
    <input type="text" v-model="message" />

    <button class="btn" :data-clipboard-text="message">Copy</button>
  </div>
</template>
 
<script>
import ClipboardJS from "clipboard";

export default {
  data: function() {
    return {
      message: "Copy These Text"
    };
  },

  mounted() {
    // 创建的时候就绑定事件
    var clipboard = new ClipboardJS(".btn");

    clipboard.on("success", function(e) {
      alert(e.text);
      console.log(e);
      e.clearSelection();
    });

    clipboard.on("error", function(e) {
      console.log(e);
    });
  }
};
</script>