Jor*_*rdy 10 javascript window undefined vue.js vuejs2
我目前正在将我的应用程序从Vue.js 1升级到Vue.js 2.我的主要组件中的以下函数存在问题:
<script>
export default {
ready: function listenKeyUp() {
window.addEventListener('keyup', this.handleKeyUp());
},
methods: {
handleKeyUp(e) {
if (e.keyCode === 27) {
this.$router.go({ name: '/' });
}
},
},
};
</script>
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我的控制台显示此错误:'window' is not defined
这怎么可能?我不明白原因.如何解决这个问题以及新版本出现这个问题的原因是什么?
---编辑---一些额外的代码:
main.js:
// Import plugins
import Vue from 'vue';
import VueResource from 'vue-resource';
import VueI18n from 'vue-i18n';
// Import mixins
import api from './mixins/api';
// Import router config
import router from './router';
// Register plugins
Vue.use(VueResource);
Vue.use(VueI18n);
Vue.mixin(api);
// Go
new Vue({
router,
}).$mount('#app');
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index.html的:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>New website</title>
<link rel="shortcut icon" href="/static/favicon.ico" />
<link rel="apple-touch-icon" href="/static/mobile.png">
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Lato">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
</head>
<body>
<div id="app">
<router-view></router-view>
</div>
<noscript>
<div class="container">
<div class="col-sm-6 col-sm-offset-3">
<div class="alert alert-danger">
JavaScript is disabled in your web browser!
</div>
</div>
</div>
</noscript>
</body>
</html>
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主要成分:
<template>
<div>
<div class="container">
<header>
HEADER HERE
</header>
</div>
<div id="modal" v-if=" $route.name !== 'home' " transition="modal">
<div id="modal-bg" :to="{ name: 'home' }"></div>
<div id="modal-container">
<div id="modal-header">
<h2>Modal</h2>
<router-link id="modal-close" :to="{ name: 'home' }">X</router-link>
</div>
<router-view></router-view>
</div>
</div>
<nav id="primary-navigation">
<div class="container-fluid">
<div class="row">
NAV HERE
</div>
</div>
</nav>
</div>
</template>
<script>
/* SCRIPT PART, SEE TOP OF THIS POST */
</script>
<style lang="scss">
/* CSS */
</style>
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使用浏览器引用最安全的地方是mounted()生命周期钩子.特别是如果您正在使用像Nuxt.js或类似的SSR设置.
尝试将侦听器放入您的created()方法中
您还会丢失上下文,this因此请使用词汇粗箭头来保留上下文
// rest of export
created() {
// make an event listener and pass the right `this` through
window.addEventListener('keyup', (event) => {
// if the key is escape
if (event.keyCode === 27) {
// due to `=>` this is the this you're expecting
this.keyHandler()
}
}
},
methods: {
keyHandler() {
// this *should* be the right this
this.$router.go({ name: '/' })
}
}
// rest of export
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完全未经测试,但应该可以工作(vue 2.x)
它与Eslint有关。把这个:
"env": {
"browser": true,
"node": true
}
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.eslintrc.js在我的根里面修复了这个问题。(来源)
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