在src目录下新建components文件夹

1.新建module文件夹，然后新建v-alert.vue

<template>
  <transition name="fade">
    <div
        class="v-alert g-center"
        :style="{zIndex}">
      <div
          class="v-cont"
          :class="{shadow:!hideCont}"
          :style="[innerWidth]">
        <div
            v-if="title.trim()"
            :style="[{backgroundColor:bgColorTit,color:cancelCol},titleStyle]"
            class="title g-font18">
          {{title}}
          <span class="title-data">{{titleData}}</span>
        </div>
        <div
            v-if="isCancel"
            class="v-cancel">
          <div
              class="cancel-icon"
              :style="{color:cancelCol}"
              @click="cancel">
            &#xe656;
          </div>
        </div>
        <slot name="slot3"></slot>
        <div
            v-if="!hideCont"
            :style="styles"
            class="content">
          <slot></slot>
        </div>
        <slot name="slot2"></slot>
      </div>
      <div
          class="g-fixed alert-wrap"
          @click="$emit('cancel')"
          :style="{backgroundColor:bgWrapColor}"></div>
    </div>
  </transition>
</template>

<script>
  export default {
    name: "v-alert",
    props: {
      title: {default: ""},
      // titFontSize:{default: '16'},
      bgColorTit: {default: "#40404C"},
      bgColor: {default: "#fff"}, // 背景色
      bgWrapColor: {default: "rgba(42, 47, 59, 0.6)"}, //外套背景色
      cancelCol: {default: "#fff"}, //按钮颜色
      width: {required: true, type: Number}, //宽度
      minWidth: {type: Number, default: 0},
      isCancel: {type: Boolean, default: true}, //是否显示关闭按钮
      titleData: {default: ""},
      hideCont: {type: Boolean, default: false}, //是否隐藏cont
      zIndex: {default: 2000},
      styles: {
        default() {
          return {};
        },
        type: Object
      },
      titleStyle: {
        default() {
          return {};
        },
        type: Object
      },
    },
    components: {},
    computed: {
      innerWidth() {
        let dfu = {
          backgroundColor: this.bgColor
        };
        this.minWidth > 0
          ? dfu.minWidth = `${this.minWidth}px`
          : dfu.width = `${this.width}px`;
        return dfu;
      }
    },
    methods: {
      cancel() {
        this.$emit("cancel");
      }
    },
    mounted() {
      document.addEventListener(
        "keydown",
        event => {
          let keyCode = this.$_lib.getKeycode(event);
          if (keyCode === 'Escape' || keyCode === 27) this.$emit("cancel");
        },
        false
      );
    }
  };
</script>

<style lang="scss"
    rel="stylesheet/scss"
    scoped>
  .v-alert {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
    .alert-wrap {
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      /*z-index: 2000;*/
    }
    .v-cont {
      min-width: 100px;
      min-height: 100px;
      background-color: #ffffff;
      position: relative;
      border-radius: 2px;
      .shadow {
        box-shadow: 0 2px 30px rgba(42, 47, 59, 0.2);
      }
      z-index: 2001;
      .title {
        width: 100%;
        line-height: 70px;
        color: #ffffff;
        padding-left: 30px;
      }
      .title-data {
        color: #f8e19a;
      }
      .content {
        padding: 40px;
        /*padding: 60px 40px 50px 40px;*/
        word-wrap: break-word;
        text-align: left;
      }
    }

    .v-cancel {
      position: absolute;
      top: 0;
      right: 0;
      width: 100%;
      height: 70px;
    }
    .cancel-icon {
      position: absolute;
      text-align: center;
      width: 20px;
      height: 20px;
      line-height: 20px;
      right: 20px;
      top: 50%;
      margin-top: -10px;
      color: #ffffff;
      cursor: pointer;
      transition: 200ms;
      &:hover {
        -webkit-transform: rotate(90deg);
        -moz-transform: rotate(90deg);
        -ms-transform: rotate(90deg);
        -o-transform: rotate(90deg);
        transform: rotate(90deg);
      }
    }
  }
</style>

2.在nodule同级目录新建vue-component.js

import VAlert from './v-alert'; //弹窗

export default {
  install(Vue) {
    Vue.component('VAlert', VAlert);
  }
};

3.在main.js中注册为全局组件

import vueComponent from "./components/vue-component";
Vue.use(vueComponent);

 4.在其他组件可以直接用了,无需import

<template>
    <v-alert
      v-if="is_alert"
      @cancel="is_alert=false"
      bg-color-tit="#40404C"
      cancel-col="#fff"
      :title="提示"
      :width="680">
      <div></div>
    </v-alert>
</template>