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JavaScript基础

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2 <html xmlns="http://www.w3.org/1999/xhtml"> 3 <head> 4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 5 <title>javascript基础</title> 6 <script type="text/javascript"> 7        function show() 8        { 9            alert("js学习之旅!");10        }11 </script>12 13 <script src="jsfile.js" type="text/javascript">14 </script>15 16 <script type="text/javascript">17       var p = 3.14;18       function compute(r)19       {20           return 2*p*r*r;21       }22       function show3()23       {24         var r = document.getElementById("radius").value;25         var area = compute(r);26         document.getElementById("area").value=area;  27       }28 </script>29 30 <script type="text/javascript>  //这个有点问题 显示不出来31        function show4()32       {33           confirm("确认提交吗?")34       prompt("提示。。。。")35       }36 </script>37 38 </head>39 40 <body onl oad="show2()">41       <script type="text/javascript">42        document.write("js学习");43       </script>44       45       <form>46       输入半径:<input type="text"; name="r" id="radius">47       <input type="button" value="计算" onclick="show3()">48       圆的面积:<input type="text" name="area" id="area">49       </form>50       <input type="text"; name="确认框&nbsp提示框" onclick="show4()">51 </body>52 </html>

 

1 //外部js文件代码2 function show2()3        {4            alert("js2222学习之旅!");5        }

 

JavaScript基础