Angular--Port 4200 is already in use. Use '--port' to specify a different port.

一时失言乱红尘 2021-09-27 05:46 346阅读 0赞

# 前言 #

因为之前对前端设置这方面有一定的学习，认为这方面学起来非常有意思，但是因为自己可能是菜鸟，所以出现的错误也不少。在网上总是能看到很多前端大神提起Angular，但是我对这方面不太了解，所以就想学，丰富自己对前端的认识，因为之前没有接触过这方面的知识，所以出现错误的概率很大，接下来我就介绍一下我遇到的这个bug，希望对大家有帮助

# 内容 #

搭建好Angular环境，因为教程里面是用cmd搭建，然后给出了查看搭建结果的的代码：`ng serve`，所以我就尝试了一下，出现的内容是这样的，如下：  
![这里写图片描述][70]  
这说明环境已经搭建好了，而且已经成功执行了。这个时候我的WebStorm也安装好了，于是我点击进去，找到相关文件打开，点击运行，打不开网站，并出现下面错误。

![这里写图片描述][70 1]  
因为我是刚刚才开始学习Angular的，所以觉得懵逼了，因为刚下载，什么东西都没有敲，直接运行的话应该可以的啊！但问题就是我运行不了，而且报出了上面的错误，没办法，百度一下，给出的答案是：我已经启动了该项目，所以无法再次打开，原来这样。  
解决方法：  
将cmd命令窗口关闭，然后再在WS中运行，这次成功了。在WS中部署完代码，然后成功加载，显示的内容如下：

"D:\Program Files\JetBrains\WebStorm 2018.2\bin\runnerw.exe" "C:\Program Files\nodejs\node.exe" "C:\Program Files\nodejs\node_modules\npm\bin\npm-cli.js" run start --scripts-prepend-node-path=auto
    
    > auction@0.0.0 start C:\Users\ITLuoxiaojun\auction
    > ng serve
    
    ** NG Live Development Server is running on http://localhost:4200 **
      0% compiling
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     38% building modules 241/247 modules 6 active ...\node_modules\querystringify\index.js
     39% building modules 242/247 modules 5 active ...\node_modules\querystringify\index.js
     39% building modules 243/248 modules 5 active ...lib\transport\browser\abstract-xhr.js
     39% building modules 244/248 modules 4 active ...lib\transport\browser\abstract-xhr.js
     39% building modules 247/248 modules 1 active ...lib\transport\browser\abstract-xhr.js
     39% building modules 248/248 modules 0 active
     39% building modules 249/250 modules 1 active ...modules\_array-species-constructor.js
     40% building modules 250/252 modules 2 active ..._modules\core-js\modules\_is-array.js
     40% building modules 252/252 modules 0 active
     71% sealing
     75% advanced module optimization
     76% basic chunk optimization pass 2
     79% module and chunk tree optimization
     81% module order optimization
     84% chunk order optimization
     85% chunk id optimization
     86% hashing
     88% chunk assets processing
     92% chunk asset optimization
     94% asset optimization
     95% emitting
    Hash: 4bf25b86b9f8769e283f
    Time: 14626ms
    chunk    {
       0} polyfills.bundle.js, polyfills.bundle.js.map (polyfills) 195 kB {
       4} [initial] [rendered]
    chunk    {
       1} main.bundle.js, main.bundle.js.map (main) 3.69 kB {
       3} [initial] [rendered]
    chunk    {
       2} styles.bundle.js, styles.bundle.js.map (styles) 9.77 kB {
       4} [initial] [rendered]
    chunk    {
       3} vendor.bundle.js, vendor.bundle.js.map (vendor) 2.51 MB [initial] [rendered]
    chunk    {
       4} inline.bundle.js, inline.bundle.js.map (inline) 0 bytes [entry] [rendered]
    webpack: Compiled successfully.

此时，打开浏览器，输入`http://localhost:4200`，立马可以执行，别问我为什么输入这个代码可以执行，因为这时部署时候给出的网站，如下图：  
![这里写图片描述][70 2]  
给出的网站打开的内容如下：  
![这里写图片描述][70 3]  
![这里写图片描述][70 4]  
这样说明已经成功部署了WS中的代码，然后成功在指定的网站打开。

# 总结 #

刚开始学习Angular，然后遇到bug，心中莫名有一种恐惧感，也许这是它给我的下马威，没关系，我会慢慢积累自己的能力，然后逐渐的去熟悉它，认识他，了解它，然后跟它一块合作做出所期待的美好的项目！

# end #

谢谢您的阅读！

[70]: /images/20210923/77f15d3fef254d2e9fc3cbd16b77e1e9.png
[70 1]: /images/20210923/32fadb7946ab4e27ad10a042c32f9b7f.png
[70 2]: /images/20210923/1b87057a12c04de583a16db1582d890d.png
[70 3]: /images/20210923/cf2fb8e1160a400fad7ff7d7e0459d39.png
[70 4]: /images/20210923/c15fde2ce8fc4d97ac8887fbfeff7268.png