setStrokeOpt (opt, changeElem) {
    const { id } = opt
    const bits = id.split('_')
    const [pre, val] = bits

    if (changeElem) {
      this.svgCanvas.setStrokeAttr('stroke-' + pre, val)
    }
    opt.classList.add('current')
    const elements = Array.prototype.filter.call(
      opt.parentNode.children,
      function (child) {
        return child !== opt
      }
    )
    Array.from(elements).forEach(function (element) {
      element.classList.remove('current')
    })
  }
@param {Element} opt
@param {boolean} changeElem
@returns {void}