原因：vue-router版本升级，返回promise对象，导致之前的this.$router.push()出错，但是不影响功能的实现

解决方案：

 在src下router中的index.js中添加代码，重写push和replace方法

 PS：一定要放在vueRouter实例创建之前

代码：

const originalPush = VueRouter.prototype.push

const originalReplace = VueRouter.prototype.replace

// push

VueRouter.prototype.push = function push (location, onResolve, onReject) {

  if (onResolve || onReject) return originalPush.call(this, location, onResolve, onReject)

  return originalPush.call(this, location).catch(err => err)

}

// replace

VueRouter.prototype.replace = function push (location, onResolve, onReject) {

  if (onResolve || onReject) return originalReplace.call(this, location, onResolve, onReject)

  return originalReplace.call(this, location).catch(err => err)

}