D3js V4版本画柱状图

仅供学习之用，效果图如下：
image.png
代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="https://d3js.org/d3.v4.min.js"></script>
    <style>
        #container{
            width: 800px;
            height: 500px;
            background: #333;
            margin: 0 auto;
        }
        svg{
            background: #fff;
            margin: 50px 100px;
        }
        .axis path,
        .axis line {
        fill: none;
        stroke: black;
        shape-rendering: crispEdges;
        }
    
        .axis text {
        font-family: 'Microsoft YaHei';
        font-size: 12px;
        }
        .myrect{
            fill: aqua;
        }
    </style>
</head>
<body>
    <div id="container"></div>
</body>
</html>
<script>
    let datas=[
        {
            key:"html",
            value:"34"
        },
        {
            key:"css",
            value:"54"
        },
        {
            key:"javascript",
            value:"64"
        },
        {
            key:"java",
            value:"85"
        },
        {
            key:"python",
            value:"25"
        },
        {
            key:"C++",
            value:"49"
        }
    ]
    let width=600,height=400,padding=40

    let svg=d3.select("#container")
    .append("svg")
    .attr("width",width)
    .attr("height",height)

    let xScale=d3.scaleBand()
    .domain(datas.map(d=>d.key))
    .range([padding,width-2*padding])
    .padding(0.5)

    let yScale=d3.scaleLinear()
    .domain([0,d3.max(datas,(d)=>d.value)])
    .range([height-padding*2,0])

    let xAxis=d3.axisBottom(xScale)
    let yAxis=d3.axisLeft(yScale)

    // 绘制坐标轴
svg.append('g')
        .attr('class', 'axis')
        .attr('transform', 'translate(0,'+(height-padding)+')')
        .call(xAxis)

svg.append('g')
        .attr('class', 'axis')
        .attr('transform', 'translate('+ padding+','+padding+')')
        .call(yAxis);

    svg.selectAll("rect")
    .data(datas)
    .enter()
    .append("rect")
    .attr("x",d=>xScale(d.key))
    .attr("y",d=>yScale(d.value)+padding)
    .attr("width",xScale.bandwidth())
    .attr("height",d=>height-padding*2-yScale(d.value))
    .attr("class","myrect")

</script>
D3js V4版本 画柱状图

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D3js V4版本画柱状图
