如何使用PHP实现微信小程序中的滑块功能

Page({
  data: {
    value: 50
  },
  onLoad: function () {
    this.slider = wx.createSlider({
      min: 0,
      max: 100,
      value: this.data.value,
      showValue: true,
      onChange: this.changeValue.bind(this)
    })
  },
  onReady: function () {
    this.slider.appendTo(this.selectComponent('#slider'))
  },
  changeValue: function (e) {
    this.setData({
      value: e.target.value
    })
  }
})

mPDF::$func_js .= "function initSlider() {
  let slider = wx.createSlider({
    min: 0,
    max: 100,
    value: 50,
    showValue: true,
    onChange: function (e) {
      document.getElementById('value').innerHTML = e.target.value
    }
  })
  slider.appendTo(document.getElementById('slider'))
}"

$html = '
';
$html .= '
50
';
$html .= '';

$value = $_POST['value'];
$mPDF->useTemplate($template);
$mPDF->writeHTML("
");
$mPDF->writeHTML("
$value
");
$mPDF->writeHTML('');