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JS/Jquery第课 12月16号作业
孤忆寻昔R
Original
833 people have browsed it

作业

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.   <meta charset="UTF-8">
  5.   <title>js</title>
  6. </head>
  7. <body>
  8.   <input type="text" id="username" value="" placeholder="输入数字">
  10.   <script>
  12.    var num2 = 123;
  13.     var num1 = 456;
  15.     // alert(num2<num1?'num2小于num1':'num2大于num1');
  17.   function myfunc()
  18.   {
  19.     var num2 = 123;
  20.     var num1 = 456;
  21.     if(num1<num2){
  22.       alert('num1小于num2');
  23.     } else{
  24.       alert('num2大于num1');
  25.     }
  27.   }
  29.   // function func1()
  30.   // {
  31.   //   var num3 = 90;
  32.   //   if(num3>90){
  33.   //     alert('优秀');
  34.   //   } else if(num3<=90 && num3>70){
  35.   //     alert('一般');
  36.   //   } else if(num3<=70 && num3>60){
  37.   //     alert('合格');
  38.   //   } else 
  39.   //     alert ('不及格');
  40.   // }
  42.   // function func2()
  43.   // {
  44.   //    var num4 = 90;
  45.   //   switch(num4){
  46.   //       case num4>90:
  47.   //         alert('优秀');
  48.   //         break；
  49.   //       case num4<=90 && num4>80;
  50.   //         alert('一般');
  51.   //         break;
  52.   //       case num4<=80 && num4>70;
  53.   //         alert('合格');  
  54.   //         break;
  55.   //       case num4<60;
  56.   //         alert('不及格');    
  57.   //   }
  58.   // }
  60.   // var num5 = 90;
  61. function func3()
  62. {
  63.   var num5 = 90;
  64.   if(num5>90){
  65.     alert('优秀');
  66.   } else if(num5<=90 && num5>70){
  67.     alert('一般');
  68.   } else if(num5<=70 && num5>60){
  69.     alert('合格');
  70.   }else 
  71.     alert('不合格');
  73. }
  76. function func4()
  77. {
  78.   if(num5>90){
  80.     return alert('优秀');
  81.   }
  82.   if(num5<=90 && num5>70){
  83.     return alert('一般');
  84.   }
  85.   if(num5<=70 && num5>60){
  86.     return alert('不及格');
  88.   }
  90. }
  92.  // func4(); 
  95. // for(var i=0;i<10;i++){
  96. //   console.log('i='+i);
  97. // }
  100. function func5()
  101. {
  103.   var arr=['a','b','c'];
  104.   for(var i=0;i<arr.length;i++){
  105.     console.log(arr[i]);
  107.   }
  109. }
  111. // func5();
  113. var numx = 22;
  115. if(typeof(numx)=="undefined"){
  116.   alert('未定义');
  117. } else {
  118.   alert('numx='+numx);
  119. }
  120. </script>
  121. </body>
  122. </html>




总结

1、alert();弹窗 console.log 阻断生成日志 在浏览器上的控制台Console查看内容
2、声明变量 使用 var 数组没有foreach遍历
3、写条件判断时主语代码的可读性，尽量优化

Correcting teacher：天蓬老师天蓬老师

Correction status：qualified

Teacher's comments：用console.log()会更方便些
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