方法一

const s = document.createElement('script');
    s.type = 'text/javascript';
    s.src = process.env.VUE_APP_TLOGIN;
    s.id = 'toploginstruct';
    s.setAttribute('data','style=3&placeid=headerBox&laylocate=right&reutrnurl=');
    document.body.appendChild(s);

方法二

//引用的页面
<login></login>
import login from './login.vue';
components: {
    login
  },

//login.vue
<template>
  <div>
    <login-js></login-js>
  </div>
</template>
components: {
    'login-js': {
      render(createElement) {
        return createElement('script', {
          attrs: {
            id: 'toploginstruct',
            data: 'style=3&reutrnurl=https%3a%2f%2flogin.cnki.net%2fTopLoginTest%2fh1.html%26platform%3dkjpt',
            type: 'text/javascript',
            src: '',
          },
        });
      },
      
      },
    },
  },