Import D3

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<script src="https://d3js.org/d3.v4.min.js"></script>

Code

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// set size
const margin = {
  top: 50,
  right: 50,
  bottom: 50,
  left: 50,
}
const width = window.innerWidth - margin.left - margin.right
const height = window.innerHeight - margin.top - margin.bottom

// Set Point Number
const n = 21

// X scale will use the index of our data
const xScale = d3.scaleLinear()
    .domain([0, n-1]) // input
    .range([0, width]) // output

// Y scale will use the randomly generated number
const yScale = d3.scaleLinear()
    .domain([0, 1]) // input
    .range([height, 0]) // output

// d3's line generator
const line = d3.line()
    .x(function(d, i) {
      return xScale(i)  // set the x value for the line generator
    })
    .y(function(d, i) {
      return d.y // set the y value for the line generator
    })
    .curve(d3.curveMonotoneX) // apply smoothing to the line

const dataset = d3.range(n)
    .map(function(d) {
      return {
        y: d3.randomUniform(1)()
      }
    })

// Add SVG to the page
const svg = d3.select('body')
  .append('svg')
    .attr('width', width + margin.left + margin.right)
    .attr('height', height + margin.top + margin.bottom)
  .append('g')
    .attr('transform', `translate(${margin.left}, ${margin.top})`)

// Call the X axis in a group tag
svg.append('g')
    .attr('class', 'x axis')
    .attr('transform', `translate(0, ${height})`)
    .call(d3.axisBottom(xScale)) // Create an axis component with d3.axisBottom

// Call the Y axis in a group tag
svg.append('g')
    .attr('class', 'y axis')
    .call(d3.axisLeft(yScale))

// Append the path, bind the data, and call the line generator
svg.append('path')
    .datum(dataset) // bind data to the path
    .attr('class', 'line')
    .attr('d', line) // call the line generator

// Append a circle for each data point
svg.selectAll('.dot')
    .data(dataset)
  .enter().append('circle')
    .attr('cx', function (d, i) {
      return xScale(i)
    })
    .attr('cy', function (d, i) {
      return yScale(dy)
    })
    .attr('r', 5)

Add style

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.line {
  fill: none;
  stroke: cyan;
  storke-width: 3;
}
.dot {
  fill: #ffab00;
  stroke: #FFF;
}