1、创建一个loading组件

在components文件夹下创建Loading.vue

(下面这种是故意使用setTimeout来延迟执行，给页面加载有时间渲染页面)

根据在本地存储一个num，num为1，延迟8s后执行，

num为2,延迟3s后执行

注意：countTo是插件，如果不想用就注释这串代码，不影响

components/Loading.vue代码：

<template>
  <div class="app">
    <div id="loader-wrapper">
      <div id="loader"></div>
      <div class="loader-section section-left"></div>
      <div class="loader-section section-right"></div>
      <div class="load_title">
        首次加载比较慢，请耐心等待...
        <br />
        <!-- 这里使用了vue-count-to插件 -->
        <countTo :startVal="0" :endVal="num" :duration="ms" :suffix="'%'" />
      </div>
    </div>
  </div>
</template>


<script>
export default {
  data() {
    return {
      num: 100,
      id: "",
      ms:2000,
    };
  },
  watch: {},
  created() {
    var that = this;
    if (process.client) {
      that.getID();
    }
  },
  methods: {
    getID() {
      this.id = localStorage.getItem("num");
      if (this.id == 1) {
        this.ms = 8000;
      } else if (this.id == 2) {
        this.ms = 3000;
      } else {
        this.ms = 10000;
      }
    },
    start() {},
    finish() {},
    open() {
      this.$message.error("页面加载错误，请刷新");
    },
    fail() {
      this.open();
    },
    increase(num) {
    },
  },
  mounted() {
    this.$nextTick(() => {
      this.$nuxt.$loading.start();
      this.$nuxt.$loading.finish();
    });
  },
};
</script>


<style lang="scss" scoped>
html,
body,
.app {
  height: 100%;
  margin: 0px;
  padding: 0px;
}
.chromeframe {
  margin: 0.2em 0;
  background: #ccc;
  color: #000;
  padding: 0.2em 0;
}

#loader-wrapper {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 999999;
}

#loader {
  display: block;
  position: relative;
  left: 50%;
  top: 50%;
  width: 150px;
  height: 150px;
  margin: -75px 0 0 -75px;
  border-radius: 50%;
  border: 3px solid transparent;
  /* COLOR 1 */
  border-top-color: #fff;
  -webkit-animation: spin 2s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  -ms-animation: spin 2s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  -moz-animation: spin 2s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  -o-animation: spin 2s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  animation: spin 2s linear infinite;
  /* Chrome, Firefox 16+, IE 10+, Opera */
  z-index: 1001;
}

#loader:before {
  content: "";
  position: absolute;
  top: 5px;
  left: 5px;
  right: 5px;
  bottom: 5px;
  border-radius: 50%;
  border: 3px solid transparent;
  /* COLOR 2 */
  border-top-color: #fff;
  -webkit-animation: spin 3s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  -moz-animation: spin 3s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  -o-animation: spin 3s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  -ms-animation: spin 3s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  animation: spin 3s linear infinite;
  /* Chrome, Firefox 16+, IE 10+, Opera */
}

#loader:after {
  content: "";
  position: absolute;
  top: 15px;
  left: 15px;
  right: 15px;
  bottom: 15px;
  border-radius: 50%;
  border: 3px solid transparent;
  border-top-color: #fff;
  /* COLOR 3 */
  -moz-animation: spin 1.5s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  -o-animation: spin 1.5s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  -ms-animation: spin 1.5s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  -webkit-animation: spin 1.5s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  animation: spin 1.5s linear infinite;
  /* Chrome, Firefox 16+, IE 10+, Opera */
}

@-webkit-keyframes spin {
  0% {
    -webkit-transform: rotate(0deg);
    /* Chrome, Opera 15+, Safari 3.1+ */
    -ms-transform: rotate(0deg);
    /* IE 9 */
    transform: rotate(0deg);
    /* Firefox 16+, IE 10+, Opera */
  }
  100% {
    -webkit-transform: rotate(360deg);
    /* Chrome, Opera 15+, Safari 3.1+ */
    -ms-transform: rotate(360deg);
    /* IE 9 */
    transform: rotate(360deg);
    /* Firefox 16+, IE 10+, Opera */
  }
}

@keyframes spin {
  0% {
    -webkit-transform: rotate(0deg);
    /* Chrome, Opera 15+, Safari 3.1+ */
    -ms-transform: rotate(0deg);
    /* IE 9 */
    transform: rotate(0deg);
    /* Firefox 16+, IE 10+, Opera */
  }
  100% {
    -webkit-transform: rotate(360deg);
    /* Chrome, Opera 15+, Safari 3.1+ */
    -ms-transform: rotate(360deg);
    /* IE 9 */
    transform: rotate(360deg);
    /* Firefox 16+, IE 10+, Opera */
  }
}

#loader-wrapper .loader-section {
  position: fixed;
  top: 0;
  width: 51%;
  height: 100%;
  background: #7171c6;
  /* Old browsers */
  z-index: 1000;
  -webkit-transform: translateX(0);
  /* Chrome, Opera 15+, Safari 3.1+ */
  -ms-transform: translateX(0);
  /* IE 9 */
  transform: translateX(0);
  /* Firefox 16+, IE 10+, Opera */
}

#loader-wrapper .loader-section.section-left {
  left: 0;
}

#loader-wrapper .loader-section.section-right {
  right: 0;
}

/* Loaded */

.loaded #loader-wrapper .loader-section.section-left {
  -webkit-transform: translateX(-100%);
  /* Chrome, Opera 15+, Safari 3.1+ */
  -ms-transform: translateX(-100%);
  /* IE 9 */
  transform: translateX(-100%);
  /* Firefox 16+, IE 10+, Opera */
  -webkit-transition: all 0.7s 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
  transition: all 0.7s 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
}

.loaded #loader-wrapper .loader-section.section-right {
  -webkit-transform: translateX(100%);
  /* Chrome, Opera 15+, Safari 3.1+ */
  -ms-transform: translateX(100%);
  /* IE 9 */
  transform: translateX(100%);
  /* Firefox 16+, IE 10+, Opera */
  -webkit-transition: all 0.7s 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
  transition: all 0.7s 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
}

.loaded #loader {
  opacity: 0;
  -webkit-transition: all 0.3s ease-out;
  transition: all 0.3s ease-out;
}

.loaded #loader-wrapper {
  visibility: hidden;
  -webkit-transform: translateY(-100%);
  /* Chrome, Opera 15+, Safari 3.1+ */
  -ms-transform: translateY(-100%);
  /* IE 9 */
  transform: translateY(-100%);
  /* Firefox 16+, IE 10+, Opera */
  -webkit-transition: all 0.3s 1s ease-out;
  transition: all 0.3s 1s ease-out;
}

/* JavaScript Turned Off */

.no-js #loader-wrapper {
  // display: none;
}

.no-js h1 {
  color: #222222;
}

#loader-wrapper .load_title {
  font-family: "Open Sans";
  color: #fff;
  font-size: 19px;
  width: 100%;
  text-align: center;
  z-index: 9999999999999;
  position: absolute;
  top: 60%;
  opacity: 1;
  line-height: 30px;
}

#loader-wrapper .load_title span {
  font-weight: normal;
  font-style: italic;
  font-size: 13px;
  color: #fff;
  opacity: 0.5;
}
</style>

2、在layouts/default.vue里面引入组件

文件layouts/default.vue代码：

注意：我本来想用v-show或v-if来控制loading的显示和隐藏，但是不知道为什么，不生效。所以我在这里使用的是hidden来控制loading的显示隐藏。

<template>
  <div>
    <div>
      <Loading :hidden="!show2" />
      <nuxt :hidden="show2" />
    </div>
  </div>
</template>

<script>
import Loading from "~/components/Loading.vue";
export default {
  transition: "app",
  components: {
    Loading,
  },
  data() {
    return {
      show2:true,
      id: "",
    };
  },
  methods: {
    addnum(id) {
      if (!id) {
        localStorage.setItem("num", 1);
        this.id = 1;
      } else if (id == 1) {
        localStorage.setItem("num", 2);
        this.id = 2;
      } else if (id == 2) {
        this.id = 2;
      }
    },
  },
  created() {
    var that = this;
    if (process.client) {
      document.onreadystatechange = function () {
        that.addnum(localStorage.getItem("num"));
        if (document.readyState === "complete") {
          if (that.id == 1) {
            setTimeout(function () {
              that.show2 = false;
            }, 8000);
          } else if (that.id == 2) {
            setTimeout(function () {
              that.show2 = false;
            }, 3000);
          }
        }
      };
    }
  },

};
</script>

3、第一种方法效果图

 

4、下面介绍不使用setTimeout的加载

default.vue

<template>
  <div>
    <div>
      <!-- loading -->
      <Loading :hidden="!show2" />
      <!-- 内容 -->
      <nuxt :hidden="show2" />
    </div>
  </div>
</template>

<script>
import Loading from "~/components/Loading.vue";

export default {
  transition: "app",
  components: {
    Loading,
  },
  data() {
    return {
      show2: true,
    };
  },
  created() {
    var that = this;
    if (process.client) {
      document.onreadystatechange = function () {
        if (document.readyState === "complete") {
          that.show2 = false;
        }
      };
    }
  },
};
</script>

5、loading组件

<template>
  <div class="app">
    <div id="loader-wrapper">
      <div id="loader"></div>
      <div class="loader-section section-left"></div>
      <div class="loader-section section-right"></div>
      <div class="load_title">
        首次加载比较慢，请耐心等待...
        <br />
      </div>
    </div>
  </div>
</template>


<script>
export default {
  data() {
    return {
    };
  },
  methods: {
    start() {},
    finish() {},
    //element组件
    open() {
      this.$message.error("页面加载错误，请刷新");
    },
    fail() {
      this.open();
    },
    increase(num) {
    },
  },
  mounted() {
    this.$nextTick(() => {
      this.$nuxt.$loading.start();
      this.$nuxt.$loading.finish();
    });
  },
};
</script>


<style lang="scss" scoped>
html,
body,
.app {
  height: 100%;
  margin: 0px;
  padding: 0px;
}
.chromeframe {
  margin: 0.2em 0;
  background: #ccc;
  color: #000;
  padding: 0.2em 0;
}

#loader-wrapper {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 999999;
}

#loader {
  display: block;
  position: relative;
  left: 50%;
  top: 50%;
  width: 150px;
  height: 150px;
  margin: -75px 0 0 -75px;
  border-radius: 50%;
  border: 3px solid transparent;
  /* COLOR 1 */
  border-top-color: #fff;
  -webkit-animation: spin 2s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  -ms-animation: spin 2s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  -moz-animation: spin 2s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  -o-animation: spin 2s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  animation: spin 2s linear infinite;
  /* Chrome, Firefox 16+, IE 10+, Opera */
  z-index: 1001;
}

#loader:before {
  content: "";
  position: absolute;
  top: 5px;
  left: 5px;
  right: 5px;
  bottom: 5px;
  border-radius: 50%;
  border: 3px solid transparent;
  /* COLOR 2 */
  border-top-color: #fff;
  -webkit-animation: spin 3s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  -moz-animation: spin 3s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  -o-animation: spin 3s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  -ms-animation: spin 3s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  animation: spin 3s linear infinite;
  /* Chrome, Firefox 16+, IE 10+, Opera */
}

#loader:after {
  content: "";
  position: absolute;
  top: 15px;
  left: 15px;
  right: 15px;
  bottom: 15px;
  border-radius: 50%;
  border: 3px solid transparent;
  border-top-color: #fff;
  /* COLOR 3 */
  -moz-animation: spin 1.5s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  -o-animation: spin 1.5s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  -ms-animation: spin 1.5s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  -webkit-animation: spin 1.5s linear infinite;
  /* Chrome, Opera 15+, Safari 5+ */
  animation: spin 1.5s linear infinite;
  /* Chrome, Firefox 16+, IE 10+, Opera */
}

@-webkit-keyframes spin {
  0% {
    -webkit-transform: rotate(0deg);
    /* Chrome, Opera 15+, Safari 3.1+ */
    -ms-transform: rotate(0deg);
    /* IE 9 */
    transform: rotate(0deg);
    /* Firefox 16+, IE 10+, Opera */
  }
  100% {
    -webkit-transform: rotate(360deg);
    /* Chrome, Opera 15+, Safari 3.1+ */
    -ms-transform: rotate(360deg);
    /* IE 9 */
    transform: rotate(360deg);
    /* Firefox 16+, IE 10+, Opera */
  }
}

@keyframes spin {
  0% {
    -webkit-transform: rotate(0deg);
    /* Chrome, Opera 15+, Safari 3.1+ */
    -ms-transform: rotate(0deg);
    /* IE 9 */
    transform: rotate(0deg);
    /* Firefox 16+, IE 10+, Opera */
  }
  100% {
    -webkit-transform: rotate(360deg);
    /* Chrome, Opera 15+, Safari 3.1+ */
    -ms-transform: rotate(360deg);
    /* IE 9 */
    transform: rotate(360deg);
    /* Firefox 16+, IE 10+, Opera */
  }
}

#loader-wrapper .loader-section {
  position: fixed;
  top: 0;
  width: 51%;
  height: 100%;
  background: #7171c6;
  /* Old browsers */
  z-index: 1000;
  -webkit-transform: translateX(0);
  /* Chrome, Opera 15+, Safari 3.1+ */
  -ms-transform: translateX(0);
  /* IE 9 */
  transform: translateX(0);
  /* Firefox 16+, IE 10+, Opera */
}

#loader-wrapper .loader-section.section-left {
  left: 0;
}

#loader-wrapper .loader-section.section-right {
  right: 0;
}

/* Loaded */

.loaded #loader-wrapper .loader-section.section-left {
  -webkit-transform: translateX(-100%);
  /* Chrome, Opera 15+, Safari 3.1+ */
  -ms-transform: translateX(-100%);
  /* IE 9 */
  transform: translateX(-100%);
  /* Firefox 16+, IE 10+, Opera */
  -webkit-transition: all 0.7s 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
  transition: all 0.7s 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
}

.loaded #loader-wrapper .loader-section.section-right {
  -webkit-transform: translateX(100%);
  /* Chrome, Opera 15+, Safari 3.1+ */
  -ms-transform: translateX(100%);
  /* IE 9 */
  transform: translateX(100%);
  /* Firefox 16+, IE 10+, Opera */
  -webkit-transition: all 0.7s 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
  transition: all 0.7s 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
}

.loaded #loader {
  opacity: 0;
  -webkit-transition: all 0.3s ease-out;
  transition: all 0.3s ease-out;
}

.loaded #loader-wrapper {
  visibility: hidden;
  -webkit-transform: translateY(-100%);
  /* Chrome, Opera 15+, Safari 3.1+ */
  -ms-transform: translateY(-100%);
  /* IE 9 */
  transform: translateY(-100%);
  /* Firefox 16+, IE 10+, Opera */
  -webkit-transition: all 0.3s 1s ease-out;
  transition: all 0.3s 1s ease-out;
}

/* JavaScript Turned Off */

.no-js #loader-wrapper {
  // display: none;
}

.no-js h1 {
  color: #222222;
}

#loader-wrapper .load_title {
  font-family: "Open Sans";
  color: #fff;
  font-size: 19px;
  width: 100%;
  text-align: center;
  z-index: 9999999999999;
  position: absolute;
  top: 60%;
  opacity: 1;
  line-height: 30px;
}

#loader-wrapper .load_title span {
  font-weight: normal;
  font-style: italic;
  font-size: 13px;
  color: #fff;
  opacity: 0.5;
}
</style>

6、第二种方法效果图

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