简单修改，配置vue环境

20_脚手架/vue_code/package-lock.json

@@ -12765,7 +12765,8 @@
       "version": "5.0.8",
       "resolved": "https://registry.npmmirror.com/@vue/cli-plugin-vuex/-/cli-plugin-vuex-5.0.8.tgz",
       "integrity": "sha512-HSYWPqrunRE5ZZs8kVwiY6oWcn95qf/OQabwLfprhdpFWAGtLStShjsGED2aDpSSeGAskQETrtR/5h7VqgIlBA==",
-      "dev": true
+      "dev": true,
+      "requires": {}
     },
     "@vue/cli-service": {
       "version": "5.0.8",
@@ -13197,13 +13198,15 @@
       "version": "1.8.0",
       "resolved": "https://registry.npmmirror.com/acorn-import-assertions/-/acorn-import-assertions-1.8.0.tgz",
       "integrity": "sha512-m7VZ3jwz4eK6A4Vtt8Ew1/mNbP24u0FhdyfA7fSvnJR6LMdfOYnmuIrrJAgrYfYJ10F/otaHTtrtrtmHdMNzEw==",
-      "dev": true
+      "dev": true,
+      "requires": {}
     },
     "acorn-jsx": {
       "version": "5.3.2",
       "resolved": "https://registry.npmmirror.com/acorn-jsx/-/acorn-jsx-5.3.2.tgz",
       "integrity": "sha512-rq9s+JNhf0IChjtDXxllJ7g41oZk5SlXtp0LHwyA5cejwn7vKmKp4pPri6YEePv2PU65sAsegbXtIinmDFDXgQ==",
-      "dev": true
+      "dev": true,
+      "requires": {}
     },
     "acorn-walk": {
       "version": "8.2.0",
@@ -13262,7 +13265,8 @@
       "version": "3.5.2",
       "resolved": "https://registry.npmmirror.com/ajv-keywords/-/ajv-keywords-3.5.2.tgz",
       "integrity": "sha512-5p6WTN0DdTGVQk6VjcEju19IgaHudalcfabD7yhDGeA6bcQnmL+CpveLJq/3hvfwd1aof6L386Ougkx6RfyMIQ==",
-      "dev": true
+      "dev": true,
+      "requires": {}
     },
     "ansi-colors": {
       "version": "4.1.3",
@@ -14059,7 +14063,8 @@
       "version": "6.3.1",
       "resolved": "https://registry.npmmirror.com/css-declaration-sorter/-/css-declaration-sorter-6.3.1.tgz",
       "integrity": "sha512-fBffmak0bPAnyqc/HO8C3n2sHrp9wcqQz6ES9koRF2/mLOVAx9zIQ3Y7R29sYCteTPqMCwns4WYQoCX91Xl3+w==",
-      "dev": true
+      "dev": true,
+      "requires": {}
     },
     "css-loader": {
       "version": "6.7.3",
@@ -14245,7 +14250,8 @@
       "version": "3.1.0",
       "resolved": "https://registry.npmmirror.com/cssnano-utils/-/cssnano-utils-3.1.0.tgz",
       "integrity": "sha512-JQNR19/YZhz4psLX/rQ9M83e3z2Wf/HdJbryzte4a3NSuafyp9w/I4U+hx5C2S9g41qlstH7DEWnZaaj83OuEA==",
-      "dev": true
+      "dev": true,
+      "requires": {}
     },
     "csso": {
       "version": "4.2.0",
@@ -15732,7 +15738,8 @@
       "version": "5.1.0",
       "resolved": "https://registry.npmmirror.com/icss-utils/-/icss-utils-5.1.0.tgz",
       "integrity": "sha512-soFhflCVWLfRNOPU3iv5Z9VUdT44xFRbzjLsEzSr5AQmgqPMTHdU3PMT1Cf1ssx8fLNJDA1juftYl+PUcv3MqA==",
-      "dev": true
+      "dev": true,
+      "requires": {}
     },
     "ieee754": {
       "version": "1.2.1",
@@ -17099,25 +17106,29 @@
       "version": "5.1.2",
       "resolved": "https://registry.npmmirror.com/postcss-discard-comments/-/postcss-discard-comments-5.1.2.tgz",
       "integrity": "sha512-+L8208OVbHVF2UQf1iDmRcbdjJkuBF6IS29yBDSiWUIzpYaAhtNl6JYnYm12FnkeCwQqF5LeklOu6rAqgfBZqQ==",
-      "dev": true
+      "dev": true,
+      "requires": {}
     },
     "postcss-discard-duplicates": {
       "version": "5.1.0",
       "resolved": "https://registry.npmmirror.com/postcss-discard-duplicates/-/postcss-discard-duplicates-5.1.0.tgz",
       "integrity": "sha512-zmX3IoSI2aoenxHV6C7plngHWWhUOV3sP1T8y2ifzxzbtnuhk1EdPwm0S1bIUNaJ2eNbWeGLEwzw8huPD67aQw==",
-      "dev": true
+      "dev": true,
+      "requires": {}
     },
     "postcss-discard-empty": {
       "version": "5.1.1",
       "resolved": "https://registry.npmmirror.com/postcss-discard-empty/-/postcss-discard-empty-5.1.1.tgz",
       "integrity": "sha512-zPz4WljiSuLWsI0ir4Mcnr4qQQ5e1Ukc3i7UfE2XcrwKK2LIPIqE5jxMRxO6GbI3cv//ztXDsXwEWT3BHOGh3A==",
-      "dev": true
+      "dev": true,
+      "requires": {}
     },
     "postcss-discard-overridden": {
       "version": "5.1.0",
       "resolved": "https://registry.npmmirror.com/postcss-discard-overridden/-/postcss-discard-overridden-5.1.0.tgz",
       "integrity": "sha512-21nOL7RqWR1kasIVdKs8HNqQJhFxLsyRfAnUDm4Fe4t4mCWL9OJiHvlHPjcd8zc5Myu89b/7wZDnOSjFgeWRtw==",
-      "dev": true
+      "dev": true,
+      "requires": {}
     },
     "postcss-loader": {
       "version": "6.2.1",
@@ -17222,7 +17233,8 @@
       "version": "3.0.0",
       "resolved": "https://registry.npmmirror.com/postcss-modules-extract-imports/-/postcss-modules-extract-imports-3.0.0.tgz",
       "integrity": "sha512-bdHleFnP3kZ4NYDhuGlVK+CMrQ/pqUm8bx/oGL93K6gVwiclvX5x0n76fYMKuIGKzlABOy13zsvqjb0f92TEXw==",
-      "dev": true
+      "dev": true,
+      "requires": {}
     },
     "postcss-modules-local-by-default": {
       "version": "4.0.0",
@@ -17257,7 +17269,8 @@
       "version": "5.1.0",
       "resolved": "https://registry.npmmirror.com/postcss-normalize-charset/-/postcss-normalize-charset-5.1.0.tgz",
       "integrity": "sha512-mSgUJ+pd/ldRGVx26p2wz9dNZ7ji6Pn8VWBajMXFf8jk7vUoSrZ2lt/wZR7DtlZYKesmZI680qjr2CeFF2fbUg==",
-      "dev": true
+      "dev": true,
+      "requires": {}
     },
     "postcss-normalize-display-values": {
       "version": "5.1.0",
@@ -19087,7 +19100,8 @@
           "version": "8.12.0",
           "resolved": "https://registry.npmmirror.com/ws/-/ws-8.12.0.tgz",
           "integrity": "sha512-kU62emKIdKVeEIOIKVegvqpXMSTAMLJozpHZaJNDYqBjzlSYXQGviYwN1osDLJ9av68qHd4a2oSjd7yD4pacig==",
-          "dev": true
+          "dev": true,
+          "requires": {}
         }
       }
     },
@@ -19214,7 +19228,8 @@
       "version": "7.5.9",
       "resolved": "https://registry.npmmirror.com/ws/-/ws-7.5.9.tgz",
       "integrity": "sha512-F+P9Jil7UiSKSkppIiD94dN07AwvFixvLIj1Og1Rl9GGMuNipJnV9JzjD6XuqmAeiswGvUmNLjr5cFuXwNS77Q==",
-      "dev": true
+      "dev": true,
+      "requires": {}
     },
     "y18n": {
       "version": "5.0.8",

20_脚手架/vue_code/src/App.vue

@@ -36,10 +36,14 @@ export default {
     }
   },
   mounted() {
-    // this.$refs.student.$on("studentName", this.getStudentName)
+    // 正常写法
-    setInterval(() => {
     this.$refs.student.$on("studentName", this.getStudentName)
-    }, 3000)
+    // 可以设置只执行一次
+    // 可以加延时
+    // this.$refs.student.$once("studentName", this.getStudentName)
+    // setInterval(() => {
+    //   this.$refs.student.$on("studentName", this.getStudentName)
+    // }, 3000)
   }
 }
 </script>