Vue.js 组件生命周期钩子函数：事件监听和弹窗控制

{"created()":{"document.addEventListener("keydown", this.handleEvent);", "window.addEventListener("beforeunload", this.showPrompt);"}, "mounted()":{"this.init();"}, "beforeDestroy()":{"document.removeEventListener("keydown", this.handleEvent);", "document.removeEventListener("beforeunload", this.showPrompt);"}, "methods":{"showPrompt(event)":{"// 自定义弹框逻辑", "event.preventDefault();", "event.returnValue = ""; // 兼容一些旧版本的浏览器", "if (event.target.innerText !== '取消') {", "this.$store.dispatch('staff/closeWebSocket');"} "}}}