[Vuejs]-In created:, my method doesn't work perfectly

In Vue, you have to draw d3 charts on the mounted hook, rather than the created hook. You can’t draw the chart if the page is not rendered – which is what happens when you use the created hook.

mounted () {
  this.add_svg() // append svg for chart
  this.plot([0, 0]) // basic plot with value = [0, 0]
}