vue项目里手写一个Js+css的动态进度条

首先，什么是进度条，跟大家举个例子，我们在浏览一个网页时，网页在加载的时候会有一个进度的提示，这样能够准确的告诉我们什么时候资源可以完全加载出来，最常见的就是一个进度条不断的变化，数字在不断的增加。
进度条经常运用于网页，即使我们意识到不是所有的东西都将瞬间被加载完成，这些进度条用于提醒使用者关于网页上具体的任务进程，譬如上传，下载，加载应用程序等。

首先展示一下效果

动态的加载进度

看代码

html

<div id="home">
    <template id="xcprogress">
      <div class="xcprogress">
        <div class="xcprogress-bar" :style="{ width: `${value}%` }">
          <span class="xcprogress-bar-value">{{ value }}%</span>
        </div>
      </div>
    </template>
  </div>

js

data() {
    return {
      value: 0,
    };
  },

  watch: {
    value(newVal) {
      if (newVal > 100) {
        this.value = 100;
      } else if (newVal < 0) {
        this.value = 0;
      }
    },
  },
  components: {},
  mounted() {
    setTimeout(() => {
      setInterval(() => {
        this.value += 20;
      }, 800);
    }, 1000);
  },

css

#home {
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 30px;
}

.xcprogress {
  width: 300px;
  height: 20px;
  background: #e5e5e5;
  border-radius: 4px;
  overflow: hidden;
}

.xcprogress-bar {
  width: 0;
  height: 100%;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  background: cornflowerblue;
  background-image: linear-gradient(
    45deg,
    rgba(255, 255, 255, 0.15) 25%,
    transparent 25%,
    transparent 50%,
    rgba(255, 255, 255, 0.15) 50%,
    rgba(255, 255, 255, 0.15) 75%,
    transparent 75%,
    transparent
  );
  background-size: 40px 40px;
  transition: width 0.6s ease;
  border-radius: 4px;
  animation: xcprogress-bar-anim 2s linear infinite;
}

.xcprogress-bar-value {
  font-size: 13px;
  font-weight: bold;
  color: white;
  margin-right: 5px;
}

@keyframes xcprogress-bar-anim {
  from {
    background-position: 40px 0;
  }

  to {
    background-position: 0 0;
  }
}

整体代码

<template>
  <div id="home">
    <template id="xcprogress">
      <div class="xcprogress">
        <div class="xcprogress-bar" :style="{ width: `${value}%` }">
          <span class="xcprogress-bar-value">{{ value }}%</span>
        </div>
      </div>
    </template>
  </div>
</template>

<script>
// @ is an alias to /src

export default {
  name: "HomeView",
  data() {
    return {
      value: 0,
    };
  },

  watch: {
    value(newVal) {
      if (newVal > 100) {
        this.value = 100;
      } else if (newVal < 0) {
        this.value = 0;
      }
    },
  },
  components: {},
  mounted() {
    setTimeout(() => {
      setInterval(() => {
        this.value += 20;
      }, 800);
    }, 1000);
  },
};
</script>
<style lang="less" scoped>
#home {
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 30px;
}

.xcprogress {
  width: 300px;
  height: 20px;
  background: #e5e5e5;
  border-radius: 4px;
  overflow: hidden;
}

.xcprogress-bar {
  width: 0;
  height: 100%;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  background: cornflowerblue;
  background-image: linear-gradient(
    45deg,
    rgba(255, 255, 255, 0.15) 25%,
    transparent 25%,
    transparent 50%,
    rgba(255, 255, 255, 0.15) 50%,
    rgba(255, 255, 255, 0.15) 75%,
    transparent 75%,
    transparent
  );
  background-size: 40px 40px;
  transition: width 0.6s ease;
  border-radius: 4px;
  animation: xcprogress-bar-anim 2s linear infinite;
}

.xcprogress-bar-value {
  font-size: 13px;
  font-weight: bold;
  color: white;
  margin-right: 5px;
}

@keyframes xcprogress-bar-anim {
  from {
    background-position: 40px 0;
  }

  to {
    background-position: 0 0;
  }
}
</style>