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console 命令行工具 X clear 

                    

                        
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console

            
var viewer=new Cesium.Viewer("cesiumContainer");

            
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <script src="https://cdn.jsdelivr.net/npm/cesium@1.94.3/Build/Cesium/Cesium.js"></script>
  <link href="https://cdn.jsdelivr.net/npm/cesium@1.94.3/Build/Cesium/Widgets/widgets.css" rel="stylesheet">
</head>
<body>
  <div id="cesiumContainer" style="width: 700px; height:400px"></div>
</body>
</html>