js简单函数运用

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<html>
   <head>
       <title>JS的作业</title>
       <script type="text/javascript">

           function f1(){
               var arr=[1000,28887,9999,56667,25667,10001,20001];
               document.write("排序前为:"+arr+"<br/>");
               for(var i=0;i<arr.length;i++){
                   for(var j=0;j<arr.length;j++){
                       if(arr[j] > arr[i]){
                           var index;
                           arr[index]=arr[j];
                           arr[j]=arr[i];
                           arr[i]=arr[index];
                       }
                   }
               }
               document.write("从小到大排列后为:"+arr);
           }

           function f(){
               var date=new Date("1988-11-27");
               var day=date.getDay();
               if(day==0){
                   document.write("这一天属于:星期天");
               }
           }

           function f2(){
               var str=new String('this is a wonderful world? worth fighting!');
               var arr=str.substring(str.length-17,str.length-1);
               document.write("截取的字符串为:"+arr+"<br/>");
               var count=0;
               for(var i=0;i<str.length;i++){
                   if(str.charAt(i)=="h"){
                       count++;
                   }
               }
               document.write("h的个数为:"+count+"<br/>");

               var str1=new String('this is a wonderful world? worth fighting!');
               var ww=str1.indexOf('w');
               //document.write(ww);
               var strr=str1.substring(str1.indexOf('w')+1,str1.length);
               //document.write(strr);
               var www=strr.indexOf('w');
               //document.write(www);
               var index=ww+www+1;
               document.write("第二个w的位置:"+index)
               }
       </script>
   </head>
   <body>
       <button onmousedown="f()">一九八八年十一月二十七日属于星期几</button>
       <button onmousedown="f1()">冒泡排序点这里哟</button>
       <button onmousedown="f2()">字符串的截取和统计的个数</button>
   </body>
</html>

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