先上效果图（x轴固定为时间轴）：
图中出现的悬浮框是鼠标悬停效果
1、环境说明：
vue版本："vue": "^2.5.2" d3版本："d3": "^5.9.1"
2、Line.vue源码
1 <template>
2 <div class="line" :id="id">
3 </div>
4 </template>
5
6 <script>
7 import * as d3 from 'd3'
8 export default {
9 name: 'line',
10 props: {
11 id: String,
12 width: Number,
13 height: Number,
14 dataset: Array
15 },
16 mounted() {
17 this.init();
18 },
19 methods: {
20 init() {
21 d3.select("#svg" + this.id).remove();
22 let width = this.width ? this.width : 600;
23 let height = this.height ? this.height : 600;
24 let padding = {
25 left: 80,
26 right: 50,
27 top: 50,
28 bottom: 50
29 }
30 let colorZ = d3.scaleOrdinal(d3.schemeDark2)
31 let parseTime = d3.timeParse("%Y-%m-%d")
32 let xScale = d3.scaleTime().range([0, width - padding.left - padding.right])
33 let dates = this.dataset.flatMap((d) => d.value.map(v => parseTime(v.key)))
34 xScale.domain([d3.min(dates), d3.max(dates)])
35 let yScale = d3.scaleLinear().range([height - padding.top - padding.bottom, 0])
36 yScale.domain([0, d3.max(this.dataset.flatMap((d) => d.value.map( v => v.value) )) + 2])
37 let xAxis = d3.axisBottom(xScale).tickFormat(d => d.getFullYear() + '-' + (d.getMonth() + 1) + '-' + d.getDate())
38 let yAxis = d3.axisLeft(yScale)
39 let svg = d3.select("#" + this.id).append("svg").attr("width", width).attr("height", height).attr("id", "svg" + this.id);
40 svg.append('g') 42 .attr('transform', 'translate(' + padding.left + ',' + (height - padding.bottom) + ')')
43 .call(xAxis)
44 .selectAll('text')
45 .attr('dx', -20)
46 .attr('dy', 10)
47 .attr('transform', 'rotate(-20)')
48 .style('font-weight', 'bold')
49 svg.append('g') 51 .attr('transform', 'translate(' + padding.left + ',' + padding.top + ')')
52 .call(yAxis)
53 .selectAll('text')
54 .style('font-weight', 'bold')
55 let line = d3.line().x(d => xScale(parseTime(d.key))).y(d => yScale(d.value))
56 this.dataset.forEach((v, vi) => {
57 let tp_x = 0,
58 tp_y =0;
59 svg.append("path")
60 .attr('d' , line(v.value))
61 .attr('transform', 'translate(' + padding.left + ',' + padding.top + ')')
62 .attr('fill', 'none')
63 .attr('stroke', (d, i) => colorZ(vi))
64 .attr("stroke-width", 2)
65 .style('stroke-dasharray', function(d, i) {
66 return d3.select(this).node().getTotalLength();
67 })
68 .style('stroke-dashoffset', function(d, i) {
69 return d3.select(this).node().getTotalLength();
70 })
71 .transition()
72 .duration(2000)
73 .ease(d3.easePolyOut)
74 .delay((d, i) => i * 200)
75 .style('stroke-dashoffset', 0)
76 svg.selectAll('circle1')
77 .data(v.value)
78 .enter()
79 .append('circle')
80 .attr('cx', (d, i) => {
81 let x = xScale(parseTime(d.key))
82 if (i === v.value.length - 1) tp_x = x - 40
83 return x
84 })
85 .attr('cy', (d, i) => {
86 let y = yScale(d.value)
87 if (i === v.value.length - 1) tp_y = y - 10
88 return y
89 })
90 .attr('r', 2)
91 .attr('transform', 'translate(' + padding.left + ',' + padding.top + ')')
92 .style("fill", (d, i) => colorZ(vi))
93 .on("mouseover", (d, i) => {
94 let g = svg.append('g')
95 .attr('id', `hoverg${vi}${d.key}${d.value}`)
96 .attr("transform", "translate(" + (xScale(parseTime(d.key)) - 20) + "," + (yScale(d.value) + 30) + ")" )
97 g.append("rect")
98 .attr("x", function(d){ return this.parentNode.getBBox().x - 3;})
99 .attr("y", function(d, i){ return this.parentNode.getBBox().y - 20})
100 .attr("width", 110)
101 .attr("height", 25)
102 .style("fill", "#fffbf0")
103 g.append('text')
104 .text(`${d.key}:${d.value}`)
105 .style("fill", colorZ(vi))
106 })
107 .on("mouseout", (d) => d3.select(`#hoverg${vi}${d.key}${d.value}`).remove())
108 .transition()
109 .duration(1500)
110 .ease(d3.easePolyIn)
111 .delay((d, i) => i * 200)
112 .attr('r', 5)
113 // svg.selectAll('text1')
114 // .data([v.name])
115 // .enter()
116 // .append('text')
117 // .attr('dx', (d, i) => tp_x)
118 // .attr('dy', (d, i) => tp_y)
119 // .attr('transform', 'translate(' + padding.left + ',' + padding.top + ')')
120 // .text((d) => d)
121 // .style("fill", (d, i) => colorZ(vi))
122 // .style('font-weight', 'bold')
123 svg.append('text')
124 .attr('dx', tp_x)
125 .attr('dy', tp_y)
126 .attr('transform', 'translate(' + padding.left + ',' + padding.top + ')')
127 .text(v.name)
128 .style("fill", colorZ(vi))
129 .style('font-weight', 'bold')
130 })
131 }
132 },
133 watch: {
134 dataset() {
135 this.init();
136 }
137 }
138 }
139 </script>
140
141 <style>
142
143 </style>
3、使用示例
1 <template>
2 <div id="test">
3 <!-- 一定要传进去一个id，随便传一个 -->
4 <line id="line" :dataset="data1"></line>
5 </div>
6 </template>
7
8 <script>
9 import line from '@/components/d3/Line'
10 export default {
11 name: 'test',
12 data() {
13 return {
14 data1: [
15 {
16 'name': '哈尔滨',
17 'value': [{key: '2015-1-1', value: 10}, {key: '2015-1-2', value: 12}, {key: '2015-1-3', value: 13}, {key: '2015-1-17', value: 17}]
18 },
19 {
20 'name': '海南',
21 'value': [{key: '2015-1-1', value: 9}, {key: '2015-1-2', value: 48}, {key: '2015-1-3', value: 5}, {key: '2015-1-17', value: 49}]
22 },
23 {
24 'name': '天津',
25 'value': [{key: '2015-1-2', value: 30}, {key: '2015-1-3', value: 1}, {key: '2015-1-4', value: 32}, {key: '2015-1-5', value: 10}]
26 }
27 ]
28 }
29 },
30 components: {
31 line
32 },
33 methods: {
34
35 }
36 }
37 </script>
38
39 <style scoped>
40 </style>
4、参考资料
https://github.com/d3/d3-scale-chromatic/blob/master/README.md#schemeCategory10
https://github.com/d3/d3-time-format#format
https://jakearchibald.com/2013/animated-line-drawing-svg/