模块化之后，想用js全局变量，遇到点困难。搜索资料后搞定，大概2个步骤：
1、定义一个vue模块，const定义变量，并用export对外暴露.
Globle.vue
<script>
// 服务端url
const SERVER_BASE_URL = 'http://10.199.xxx.x0:8081/'
export default{
SERVER_BASE_URL
}
</script>
2、在用到全局变量的模块，import后再使用
test.vue
import global_ from 'components/common/Global.vue'
console.log(global_.SERVER_BASE_URL)
------------------------------2018/12/27 定义component.js并在main.js中引用----------------------------
1. 定义并暴露
import Vue from 'vue';
let MyComm = new Vue({
methods: {
deleteCookie: function (cname) {
let d = new Date();
let expires = "expires=" + d.toGMTString();
document.cookie = cname + "=; " + expires;
},
getCookie: function (cname) {
let name = cname + "=";
let ca = document.cookie.split(';');
for (let i = 0; i < ca.length; i++) {
let c = ca[i].trim();
if (c.indexOf(name) == 0) return c.substring(name.length, c.length);
}
return "";
},
setCookie: function (cname, cvalue, exdays) {
let d = new Date();
d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000));
let expires = "expires=" + d.toGMTString();
document.cookie = cname + "=" + cvalue + "; " + expires;
}
}
})
export default MyComm;
2. main.js中引用
import MyComm from "./components/common/comm";
const role = MyComm.getCookie('ms_username')