学习css过渡动画-transition

---

前言

通常，当一个元素的样式属性值发生变化时，会立即看到页面发生变化。
css属性transition能让页面元素不是立即的、而是慢慢的从一种状态变成另外一种状态，从而表现出一种动画过程。

transition属性语法

属性和方法太多，可按实际效果调试

---

宽度改变效果

<template>
  <div class="content" :class="{'content-fade': fade}">div>
template>

<script>
import { defineComponent, ref } from "vue";

export default defineComponent({
  name: "App",
  components: {},
  setup() {
    const fade = ref(true);
    const change = () => (fade.value = !fade.value);
    setInterval(() => {
      change()
    }, 4000);
    return {
      fade,
    };
  },
});
script>
<style scoped>
.content {
  width: 200px;
  height: 120px;
  background-color: aqua;
  transition: width 3s;
  /* transition: width 3s steps(+3); */
}
.content-fade {
  width: 50px;
};
style>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34

透明度改变效果

<template>
  <div class="content" :class="{'content-fade': fade}">div>
template>

<script>
import { defineComponent, ref } from "vue";

export default defineComponent({
  name: "App",
  components: {},
  setup() {
    const fade = ref(true);
    const change = () => (fade.value = !fade.value);
    change()
    setInterval(() => {
      change()
    }, 3000);
    return {
      fade,
    };
  },
});
script>
<style scoped>
.content {
  width: 200px;
  height: 120px;
  background-color: aqua;
  transition: opacity 3s ;
}
.content-fade {
  opacity: 0;
};
style>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34

位置改变效果

<template>
  <div class="page">
    <div
      class="circle"
      :class="[fade ? 'circle-fade-in' : 'circle-fade-out']"
    >div>
  div>
template>

<script>
import { defineComponent, ref } from "vue";

export default defineComponent({
  name: "App",
  components: {},
  setup() {
    const fade = ref(true);
    const change = () => (fade.value = !fade.value);
    setInterval(() => {
      change();
    }, 5000);
    return {
      fade,
    };
  },
});
script>
<style scoped>
.page {
  width: 100vw;
  height: 100vh;
  position: relative;
}
.circle {
  position: absolute;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background-color: aqua;
  transition: all 5s linear;
}
.circle-fade-in {
  top: 0px;
  left: 0px;
}
.circle-fade-out {
  top: calc(100vh - 120px);
  left: calc(100vw - 120px);
}
style>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50

---

如有启发，可点赞收藏哟~