数据驱动的不透明度

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renderer.visualVariables = [
  {
    type: "opacity",
    field: "MEDHINC_CY",
    stops: [
      { value: 10000, opacity: 0.2, label: "$10,000" },
      { value: 100000, opacity: 0.85, label: "$100,000" }
    ]
  }
];