|
12 | 12 | </template> |
13 | 13 |
|
14 | 14 | <script> |
15 | | - export default { |
16 | | - name: 'BackToTop', |
17 | | - props: { |
18 | | - visibilityHeight: { |
19 | | - type: Number, |
20 | | - default: 400 |
21 | | - }, |
22 | | - backPosition: { |
23 | | - type: Number, |
24 | | - default: 0 |
25 | | - }, |
26 | | - customStyle: { |
27 | | - type: Object, |
28 | | - default: { |
29 | | - right: '50px', |
30 | | - bottom: '50px', |
31 | | - width: '40px', |
32 | | - height: '40px', |
33 | | - 'border-radius': '4px', |
34 | | - 'line-height': '45px', |
35 | | - background: '#e7eaf1' |
36 | | - } |
37 | | - }, |
38 | | - transitionName: { |
39 | | - type: String, |
40 | | - default: 'fade' |
41 | | - } |
| 15 | +export default { |
| 16 | + name: 'BackToTop', |
| 17 | + props: { |
| 18 | + visibilityHeight: { |
| 19 | + type: Number, |
| 20 | + default: 400 |
| 21 | + }, |
| 22 | + backPosition: { |
| 23 | + type: Number, |
| 24 | + default: 0 |
42 | 25 | }, |
43 | | - data() { |
44 | | - return { |
45 | | - visible: false, |
46 | | - interval: null |
| 26 | + customStyle: { |
| 27 | + type: Object, |
| 28 | + default: { |
| 29 | + right: '50px', |
| 30 | + bottom: '50px', |
| 31 | + width: '40px', |
| 32 | + height: '40px', |
| 33 | + 'border-radius': '4px', |
| 34 | + 'line-height': '45px', |
| 35 | + background: '#e7eaf1' |
47 | 36 | } |
48 | 37 | }, |
49 | | - mounted() { |
50 | | - window.addEventListener('scroll', this.handleScroll); |
| 38 | + transitionName: { |
| 39 | + type: String, |
| 40 | + default: 'fade' |
| 41 | + } |
| 42 | + }, |
| 43 | + data() { |
| 44 | + return { |
| 45 | + visible: false, |
| 46 | + interval: null |
| 47 | + } |
| 48 | + }, |
| 49 | + mounted() { |
| 50 | + window.addEventListener('scroll', this.handleScroll) |
| 51 | + }, |
| 52 | + beforeDestroy() { |
| 53 | + window.removeEventListener('scroll', this.handleScroll) |
| 54 | + if (this.interval) { |
| 55 | + clearInterval(this.interval) |
| 56 | + } |
| 57 | + }, |
| 58 | + methods: { |
| 59 | + handleScroll() { |
| 60 | + this.visible = window.pageYOffset > this.visibilityHeight |
51 | 61 | }, |
52 | | - beforeDestroy() { |
53 | | - window.removeEventListener('scroll', this.handleScroll); |
54 | | - if (this.interval) { |
55 | | - clearInterval(this.interval); |
56 | | - } |
| 62 | + backToTop() { |
| 63 | + const start = window.pageYOffset |
| 64 | + let i = 0 |
| 65 | + this.interval = setInterval(() => { |
| 66 | + const next = Math.floor(this.easeInOutQuad(10 * i, start, -start, 500)) |
| 67 | + if (next <= this.backPosition) { |
| 68 | + window.scrollTo(0, this.backPosition) |
| 69 | + clearInterval(this.interval) |
| 70 | + } else { |
| 71 | + window.scrollTo(0, next) |
| 72 | + } |
| 73 | + i++ |
| 74 | + }, 16.7) |
57 | 75 | }, |
58 | | - methods: { |
59 | | - handleScroll() { |
60 | | - this.visible = window.pageYOffset > this.visibilityHeight; |
61 | | - }, |
62 | | - backToTop() { |
63 | | - const start = window.pageYOffset; |
64 | | - let i = 0; |
65 | | - this.interval = setInterval(() => { |
66 | | - const next = Math.floor(this.easeInOutQuad(10 * i, start, -start, 500)); |
67 | | - if (next <= this.backPosition) { |
68 | | - window.scrollTo(0, this.backPosition); |
69 | | - clearInterval(this.interval) |
70 | | - } else { |
71 | | - window.scrollTo(0, next); |
72 | | - } |
73 | | - i++; |
74 | | - }, 16.7) |
75 | | - }, |
76 | | - easeInOutQuad(t, b, c, d) { |
77 | | - if ((t /= d / 2) < 1) return c / 2 * t * t + b; |
78 | | - return -c / 2 * (--t * (t - 2) - 1) + b; |
79 | | - } |
| 76 | + easeInOutQuad(t, b, c, d) { |
| 77 | + if ((t /= d / 2) < 1) return c / 2 * t * t + b |
| 78 | + return -c / 2 * (--t * (t - 2) - 1) + b |
80 | 79 | } |
81 | 80 | } |
| 81 | +} |
82 | 82 | </script> |
83 | 83 |
|
84 | 84 | <style scoped> |
|
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