7 

<html>
<head>
    <script>
        function a(){
                     
                     var a=prompt()
                     var op=prompt()
                     var b=prompt()
                     var c=0
                     switch(op){

                                case '+':c=parseInt(a)+parseInt(b);
                                break;
                                case '-':c=parseInt(a)-parseInt(b);
                                break;
                                case '*':c=parseInt(a)*parseInt(b);
                                break;
                                case '/':c=parseInt(a)/parseInt(b);
                                break;
                                
                                }
                     
                     alert(c)
                     }
    </script>    
</head>
<body>
     <input type='button' value='click'
      onclick='a()'/>
</body>
</html>
<html>
<head>
    <script>
        function a(){
                     
                     var s='I am a student.student'
                    
                     alert(s.length)

                     }
    </script>    
</head>
<body>
     <input type='button' value='click'
      onclick='a()'/>
</body>
</html>
<html>
<head>
    <script>
        function a(){
                     var s='I am a student. student'
                     var c=s.split(' ')
                     alert(c.length)

                     }
    </script>    
</head>
<body>
     <input type='button' value='click'
      onclick='a()'/>
</body>
</html>
<html>
<head>
    <script>
        function a(){
                     var s='3!6!5!9!2!1'
                     var A=s.split('!')
                     var s=A.slice(1,4)
                     var c=s.sort()
                     var z=c.reverse()
                     var b=z.join('$')
                      
                     alert(b)
                     alert(b.indexOf('$6')!=-1)
                     }        
    </script>    
</head>
<body>
     <input type='button' value='click'
      onclick='a()'/>
</body>
</html>
<html>
<head>
    <script>
        function html(){
                        alert('I am html')
                        }
        function pdf(){
                       alert('I am html')
                       }

        function a(){
                     var s='a.html'
                     var i=s.lastIndexOf('.')
                     var c=s.substring(i+1)
                     switch(c){
                               case 'html':html();break;
                               case 'pdf':pdf();break;
                               }
                     //aa=s.split('.')
                     //s1=aa[-1]
                    

                     }
    </script>    
</head>
<body>
     <input type='button' value='click'
      onclick='a()'/>
</body>
</html>
<html>
<head>
    <script>
        function a(){
                     var A=[3,6,5,9,2,1]
                     var s=A.slice(1,4)
                     var c=s.sort()
                     var z=c.reverse()
                     var b= z.join('#')
                     
                     alert(b)

                     }
    </script>    
</head>
<body>
     <input type='button' value='click'
      onclick='a()'/>
</body>
</html>

 

posted @ 2017-12-15 15:30  确定取消  阅读(94)  评论(0)    收藏  举报