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数据类型的练习题和判断输入的qq号

本文主要是介绍数据类型的练习题和判断输入的qq号，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 <!DOCTYPE html> <html lang="en"> <head>     <meta charset="UTF-8">     <title>Document</title> </head> <body>     <script>         var arr=['100px','abc'-6,[],-98765,34,-2,0,'300', ,function () {alert(1);},null,document,[],true,'200px'-30,'23.45元',5,Number('abc'),function () {alert(3);}];         var b=[];       for (var i = 0; i < arr.length; i++) {         // if (isNaN(arr[i])) {           // }else{         //  alert(arr[i]+'是数字')         // }             // if (Number(arr[i])===parseFloat(arr[i])) {        //        alert(arr[i]+'是数字')         // }else{                       // }         // if (typeof (arr[i]) =='number'&  arr[i]=== arr[i]) {          //        alert(arr[i]+'是数字')         // }else{                       // }}   // ------------------------查找NAN的位置--------           // if ((arr[i])==(arr[i])) {                       //    }else{       //        alert(i)       //    }}   // ------------------------判断数字-------- // if (parseFloat(arr[i] )|parseFloat(arr[i] )==0) { //             alert(arr[i] ) //          }else{               //          } //       } // ------------------------判断最大数字-------- if (parseFloat(arr[i] )|parseFloat(arr[i] )==0) {        b.push(arr[i]);        // alert(b)                  }                else{                       }}       document.write(b); document.write("</br>");   // ------------------------数组转换数字--------    for (var j = 0; j<b.length; j++) {     b[j]=parseInt(b[j])             }   document.write(b);   // ------------------------找最大--------  var c=b[0]  for (var j = 0; j<b.length; j++) {                  if (c<b[j]) {             c=b[j];         }else{             }    }       document.write("</br>"); document.write(c);       </script> </body> </html>

　　

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 <!DOCTYPE html> <html lang="en"> <head>     <meta charset="UTF-8">     <title>Document</title>     <style>         #content{color: #c3c3c3}     </style> </head> <body>     <span>请输入qq号码：</span>     <input type="text" id="put">     <input type="submit" value="判断"id="pan">     <span id="content"></span>       <script>             var put=document.getElementById('put')             c=document.getElementById('content')             pan=document.getElementById('pan');               function fn () {                  c.innerHTML="";               if (put.value.length==0) {                 c.innerHTML='还没有输入呢'               } else if   (put.value.length>10|put.value.length<5) {                     c.innerHTML='请输入5位以上并且10位以内'               } else if   (put.value.charAt(0)==0) {                         c.innerHTML='第一位不能是0'               }  else if ( isNaN(put.value) ) {                         c.innerHTML='只能输入数字'               } else  if (parseInt(put.value)==parseFloat(put.value)) {                                      }else {                     c.innerHTML='不能输入小数'               }                }                            pan.onclick=fn;                 </script> </body> </html>
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