简单HTML和JS代码绘制折线图实例页面

CSS代码：

.result-xy {
    height: 248px; width: 668px;
    max-width: calc(100% - 40px);
    margin: 80px 0 80px 40px;
    font-size: 0;
    border-top: 1px solid #E0E2E6;  border-bottom: 1px solid #E0E2E6;
    background: linear-gradient(to top, #E0E2E6, #E0E2E6 1px, transparent 1px);
    background-size: 100% 50px;
    position: relative;
    text-align: center;
}
.result-xy::after {
    content: '10\A 8\A 6\A 4\A 2 \A 0';
    white-space: pre-wrap;
    position: absolute;
    font-size: 14px;
    line-height: 50px;
    top: -26px; left: -1.5em;
}
.result-bg {
    display: inline-block;
    width: calc((100% - 16px * 13) / 12); height: 100%;
    background-color: #eee;
    position: relative;
}
.result-bg + .result-bg {
    margin-left: 16px;
}
.result-bg::after {
    content: attr(data-month)'月';
    position: absolute;
    bottom: -2em;
    left: 0; right: 0;
    text-align: center;    
    font-size: 12px;
    color: gray;
}
.result-bar {
    position: absolute;
    width: 100%;
    bottom: 0; left: 0;
    background-color: #69a8f7;
}
.result-bar > s {
    position: absolute;
    width: 6px; height: 6px;
    background-color: #fff;
    color: #97cd74;
    border: 2px solid;
    border-radius: 50%;
    top: 15px; left: 0; right: 0;
    margin: auto;
}
.result-bar i[line] {
    position: absolute;
    box-sizing: border-box;
    border-left: 3px solid #fff; border-right: 3px solid #fff;
    height: 2px;
    background-color: #97cd74;
    transform-origin: left center;
    left: 50%; top: 50%; margin-top: -1px;
    -ms-pointer-events: none;
    pointer-events: none;
    z-index: 1;
}
                

HTML代码：

<div id="chartX" class="result-xy">
    <div class="result-bg" data-month="1">
        <span class="result-bar" style="height: 84%"><s title="8.4"></s></span>
    </div>
    ...
    <div class="result-bg" data-month="12">
        <span class="result-bar" style="height: 92%"><s title="9.2"></s></span>
    </div>
</div>
                

JS代码：

var eleDots = document.querySelectorAll('#chartX s');

// 这个是折线方法
var fnLineChart = function (eles) {
    [].slice.call(eles).forEach(function (ele, index) {
        var eleNext = eleDots[index + 1];
        if (!eleNext) { return;  }
        var eleLine = ele.querySelector('i');
        if (!eleLine) {
            eleLine = document.createElement('i');
            eleLine.setAttribute('line', '');
            ele.appendChild(eleLine);
        }
        // 记录坐标
        var boundThis = ele.getBoundingClientRect();
        // 下一个点的坐标
        var boundNext = eleNext.getBoundingClientRect();
        // 计算长度和旋转角度
        var x1 = boundThis.left, y1 = boundThis.top;
        var x2 = boundNext.left, y2 = boundNext.top;
        // 长度
        var distance = Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));
        // 弧度
        var radius = Math.atan((y2 - y1) / (x2 - x1));
        // 设置线条样式
        eleLine.style.width = distance + 'px';
        eleLine.style.msTransform = 'rotate('+ radius +'rad)';
        eleLine.style.transform = 'rotate('+ radius +'rad)';
    });
};

// 调用折线方法
fnLineChart(eleDots);

// 浏览器尺寸改变时候
window.addEventListener('resize', function () {
    fnLineChart(eleDots);
});