问题描述： 想试试安装 element-ui 有没有完成
结果出现报错信息如下：
dom.js?5924:19 Uncaught TypeError: Cannot read property ‘prototype’ of undefined
at eval (dom.js?5924:19)
at Object…/node_modules/element-ui/lib/utils/dom.js (chunk-vendors.js:2617)
at webpack_require (app.js:849)
at fn (app.js:151)
at eval (popup-manager.js?4b26:9)
at Object…/node_modules/element-ui/lib/utils/popup/popup-manager.js (chunk-vendors.js:2665)
at webpack_require (app.js:849)
at fn (app.js:151)
at eval (index.js?5128:14)
at Object…/node_modules/element-ui/lib/utils/popup/index.js (chunk-vendors.js:2653)
eval @ dom.js?5924:19
./node_modules/element-ui/lib/utils/dom.js @ chunk-vendors.js:2617
webpack_require @ app.js:849
fn @ app.js:151
eval @ popup-manager.js?4b26:9
./node_modules/element-ui/lib/utils/popup/popup-manager.js @ chunk-vendors.js:2665
webpack_require @ app.js:849
fn @ app.js:151
eval @ index.js?5128:14
./node_modules/element-ui/lib/utils/popup/index.js @ chunk-vendors.js:2653
webpack_require @ app.js:849
fn @ app.js:151
eval @ vue-popper.js?e974:9
./node_modules/element-ui/lib/utils/vue-popper.js @ chunk-vendors.js:2761
webpack_require @ app.js:849
fn @ app.js:151
5 @ select.js?4e4b:523
webpack_require @ select.js?4e4b:21
61 @ select.js?4e4b:1053
webpack_require @ select.js?4e4b:21
eval @ select.js?4e4b:85
eval @ select.js?4e4b:88
./node_modules/element-ui/lib/select.js @ chunk-vendors.js:2466
webpack_require @ app.js:849
fn @ app.js:151
eval @ element-ui.common.js?5c96:308
webpack_require @ element-ui.common.js?5c96:21
eval @ element-ui.common.js?5c96:735
webpack_require @ element-ui.common.js?5c96:21
eval @ element-ui.common.js?5c96:362
webpack_require @ element-ui.common.js?5c96:21
eval @ element-ui.common.js?5c96:85
eval @ element-ui.common.js?5c96:88
./node_modules/element-ui/lib/element-ui.common.js @ chunk-vendors.js:2294
webpack_require @ app.js:849
fn @ app.js:151
eval @ main.js:12
./src/main.js @ app.js:1019
webpack_require @ app.js:849
fn @ app.js:151
1 @ app.js:1032
webpack_require @ app.js:849
checkDeferredModules @ app.js:46
(anonymous) @ app.js:925
(anonymous) @ app.js:928
Show 15 more frames
sockjs.js?9be2:1609 GET http://192.168.124.218:8080/sockjs-node/info?t=1614068632900 net::ERR_CONNECTION_REFUSED
AbstractXHRObject._start @ sockjs.js?9be2:1609
eval @ sockjs.js?9be2:1498
setTimeout (async)
AbstractXHRObject @ sockjs.js?9be2:1497
XHRCorsObject @ sockjs.js?9be2:2875
InfoAjax @ sockjs.js?9be2:356
InfoReceiver._getReceiver @ sockjs.js?9be2:539
InfoReceiver.doXhr @ sockjs.js?9be2:556
eval @ sockjs.js?9be2:525
setTimeout (async)
InfoReceiver @ sockjs.js?9be2:524
SockJS @ sockjs.js?9be2:734
SockJSClient @ SockJSClient.js?0a33:43
initSocket @ socket.js?e29c:20
eval @ socket.js?e29c:39
setTimeout (async)
eval @ socket.js?e29c:38
EventTarget.dispatchEvent @ sockjs.js?9be2:170
eval @ sockjs.js?9be2:973
setTimeout (async)
SockJS._close @ sockjs.js?9be2:961
SockJS._transportMessage @ sockjs.js?9be2:901
EventEmitter.emit @ sockjs.js?9be2:86
WebSocketTransport.ws.onmessage @ sockjs.js?9be2:2965
sockjs.js?9be2:1609 GET http://192.168.124.218:8080/sockjs-node/info?t=1614068636901 net::ERR_CONNECTION_REFUSED
AbstractXHRObject._start @ sockjs.js?9be2:1609
eval @ sockjs.js?9be2:1498
setTimeout (async)
AbstractXHRObject @ sockjs.js?9be2:1497
XHRCorsObject @ sockjs.js?9be2:2875
InfoAjax @ sockjs.js?9be2:356
InfoReceiver._getReceiver @ sockjs.js?9be2:539
InfoReceiver.doXhr @ sockjs.js?9be2:556
eval @ sockjs.js?9be2:525
setTimeout (async)
InfoReceiver @ sockjs.js?9be2:524
SockJS @ sockjs.js?9be2:734
SockJSClient @ SockJSClient.js?0a33:43
initSocket @ socket.js?e29c:20
eval @ socket.js?e29c:39
setTimeout (async)
eval @ socket.js?e29c:38
EventTarget.dispatchEvent @ sockjs.js?9be2:170
eval @ sockjs.js?9be2:973
setTimeout (async)
SockJS._close @ sockjs.js?9be2:961
SockJS._receiveInfo @ sockjs.js?9be2:790
g @ sockjs.js?9be2:66
EventEmitter.emit @ sockjs.js?9be2:86
eval @ sockjs.js?9be2:567
g @ sockjs.js?9be2:66
EventEmitter.emit @ sockjs.js?9be2:86
eval @ sockjs.js?9be2:374
g @ sockjs.js?9be2:66
EventEmitter.emit @ sockjs.js?9be2:86
xhr.onreadystatechange @ sockjs.js?9be2:1601
XMLHttpRequest.send (async)
AbstractXHRObject._start @ sockjs.js?9be2:1609
eval @ sockjs.js?9be2:1498
setTimeout (async)
AbstractXHRObject @ sockjs.js?9be2:1497
XHRCorsObject @ sockjs.js?9be2:2875
InfoAjax @ sockjs.js?9be2:356
InfoReceiver._getReceiver @ sockjs.js?9be2:539
InfoReceiver.doXhr @ sockjs.js?9be2:556
eval @ sockjs.js?9be2:525
setTimeout (async)
InfoReceiver @ sockjs.js?9be2:524
SockJS @ sockjs.js?9be2:734
SockJSClient @ SockJSClient.js?0a33:43
initSocket @ socket.js?e29c:20
eval @ socket.js?e29c:39
setTimeout (async)
eval @ socket.js?e29c:38
EventTarget.dispatchEvent @ sockjs.js?9be2:170
eval @ sockjs.js?9be2:973
setTimeout (async)
SockJS._close @ sockjs.js?9be2:961
SockJS._transportMessage @ sockjs.js?9be2:901
EventEmitter.emit @ sockjs.js?9be2:86
WebSocketTransport.ws.onmessage @ sockjs.js?9be2:2965
sockjs.js?9be2:1609 GET http://192.168.124.218:8080/sockjs-node/info?t=1614068751901 net::ERR_CONNECTION_REFUSED
AbstractXHRObject._start @ sockjs.js?9be2:1609
eval @ sockjs.js?9be2:1498
setTimeout (async)
AbstractXHRObject @ sockjs.js?9be2:1497
XHRCorsObject @ sockjs.js?9be2:2875
InfoAjax @ sockjs.js?9be2:356
InfoReceiver._getReceiver @ sockjs.js?9be2:539
InfoReceiver.doXhr @ sockjs.js?9be2:556
eval @ sockjs.js?9be2:525
setTimeout (async)
InfoReceiver @ sockjs.js?9be2:524
SockJS @ sockjs.js?9be2:734
SockJSClient @ SockJSClient.js?0a33:43
initSocket @ socket.js?e29c:20
eval @ socket.js?e29c:39
setTimeout (async)
eval @ socket.js?e29c:38
EventTarget.dispatchEvent @ sockjs.js?9be2:170
eval @ sockjs.js?9be2:973
setTimeout (async)
SockJS._close @ sockjs.js?9be2:961
SockJS._transportMessage @ sockjs.js?9be2:901
EventEmitter.emit @ sockjs.js?9be2:86
WebSocketTransport.ws.onmessage @ sockjs.js?9be2:2965
sockjs.js?9be2:1609 GET http://192.168.124.218:8080/sockjs-node/info?t=1614068755899 net::ERR_CONNECTION_REFUSED
AbstractXHRObject._start @ sockjs.js?9be2:1609
eval @ sockjs.js?9be2:1498
setTimeout (async)
AbstractXHRObject @ sockjs.js?9be2:1497
XHRCorsObject @ sockjs.js?9be2:2875
InfoAjax @ sockjs.js?9be2:356
InfoReceiver._getReceiver @ sockjs.js?9be2:539
InfoReceiver.doXhr @ sockjs.js?9be2:556
eval @ sockjs.js?9be2:525
setTimeout (async)
InfoReceiver @ sockjs.js?9be2:524
SockJS @ sockjs.js?9be2:734
SockJSClient @ SockJSClient.js?0a33:43
initSocket @ socket.js?e29c:20
eval @ socket.js?e29c:39
setTimeout (async)
eval @ socket.js?e29c:38
EventTarget.dispatchEvent @ sockjs.js?9be2:170
eval @ sockjs.js?9be2:973
setTimeout (async)
SockJS._close @ sockjs.js?9be2:961
SockJS._receiveInfo @ sockjs.js?9be2:790
g @ sockjs.js?9be2:66
EventEmitter.emit @ sockjs.js?9be2:86
eval @ sockjs.js?9be2:567
g @ sockjs.js?9be2:66
EventEmitter.emit @ sockjs.js?9be2:86
eval @ sockjs.js?9be2:374
g @ sockjs.js?9be2:66
EventEmitter.emit @ sockjs.js?9be2:86
xhr.onreadystatechange @ sockjs.js?9be2:1601
XMLHttpRequest.send (async)
AbstractXHRObject._start @ sockjs.js?9be2:1609
eval @ sockjs.js?9be2:1498
setTimeout (async)
AbstractXHRObject @ sockjs.js?9be2:1497
XHRCorsObject @ sockjs.js?9be2:2875
InfoAjax @ sockjs.js?9be2:356
InfoReceiver._getReceiver @ sockjs.js?9be2:539
InfoReceiver.doXhr @ sockjs.js?9be2:556
eval @ sockjs.js?9be2:525
setTimeout (async)
InfoReceiver @ sockjs.js?9be2:524
SockJS @ sockjs.js?9be2:734
SockJSClient @ SockJSClient.js?0a33:43
initSocket @ socket.js?e29c:20
eval @ socket.js?e29c:39
setTimeout (async)
eval @ socket.js?e29c:38
EventTarget.dispatchEvent @ sockjs.js?9be2:170
eval @ sockjs.js?9be2:973
setTimeout (async)
SockJS._close @ sockjs.js?9be2:961
SockJS._transportMessage @ sockjs.js?9be2:901
EventEmitter.emit @ sockjs.js?9be2:86
WebSocketTransport.ws.onmessage @ sockjs.js?9be2:2965
main.js
package.json
终端情况【 并没有报错 】：
问题解决： 暂时没有找到有效的解决方法。【试过 把 cli 版本转换成 3.X ，也试过main.js 里面3 和 4 的语法转换 】
但是 安装 vue 2.0 没有问题：如图：
package.json
main.js
App.vue
