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console 命令行工具 X clear 

                    

                        
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console

            
   var body = d3.select("body");
          body.selectAll("p")
          .text("Hello World!")
          //修改段落的颜色和字体大小
          .style("color","red")
          .style("font-size","72px");

        



            
<html> 
  <head> 
      <meta charset="utf-8"> 
      <script src="https://d3js.org/d3.v5.min.js"></script>
  </head> 
    <body> 
        <p></p>
        <p></p>
    </body> 
</html>

            

                
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