lovecoding
/
web0331


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      var arr = new Array();
      var obj = new Object();
      var date = new Date();
      console.log(arr,obj,date)
      var num = new Number();
      var str = new String();
      var aaa = new Boolean();
      var b = 3.6415926;
      //parseInt 整数
     //parseFloat 浮点数
      console.log(parseInt(b));
      console.log(parseFloat(b));
    </script>
  </body>
</html>