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js数据类型数组、对象以及json类型的常用操作
昔年
Original
710 people have browsed it

1.数组

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  6.     <title>Document</title>
  7. </head>
  8. <body>
  9.     <script>
  10.         var course = ['php', 'js', 'css', 'java','c++'];
  11.         console.log(course.length);
  12.         console.log(course[2]);
  13.         console.log(Array.isArray(course));
  15.         //遍历一个数组
  16.         for(var i = 0; i <course.length; i++){
  17.             console.log(course[i]);
  18.         }
  19.         course.forEach(function(item, index, array){
  20.             document.body.innerHTML += "<li>" + index + item + "</li>";
  21.         })
  22.         document.body.innerHTML += "<hr>";
  23.         //使用slice获取数组元素
  24.         console.log(course.slice(0,2));
  25.         console.log(course.slice(0));
  26.         //使用splice实现数组元素的删除，插入，替换
  27.         course.splice(2, 0,'html');
  28.         console.log(course);
  29.         course.splice(2, 1,'go');
  30.         console.log(course);
  31.         course.splice(2,1);
  32.         console.log(course);
  34.     </script>
  35. </body>
  36. </html>

2.对象

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  6.     <title>Document</title>
  7. </head>
  8. <body>
  9.     <script>
  10.         var staff = {
  11.             message:{
  12.                 id: 108,
  13.                 name:'peter',
  14.             },
  15.             department:'office',
  16.             grade:'primary',
  17.             postion:'php开发工程师',
  18.             salary:8000,
  19.         }
  20.         console.table(staff);
  21.         console.log(staff['message'].name);
  22.         for (key in staff){
  23.             console.log(staff[key]);
  24.         }
  26.     </script>
  27. </body>
  28. </html>

3.将js的对象转换为json格式

  1. <!DOCTYPE html>
  2. <html lang="en">
  3. <head>
  4.     <meta charset="UTF-8">
  5.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  6.     <title>Document</title>
  7. </head>
  8. <body>
  9.     <script>
  10.         var staff = {
  11.             message:{
  12.                 id: 108,
  13.                 name:'peter',
  14.             },
  15.             department:'office',
  16.             grade:'primary',
  17.             postion:'php开发工程师',
  18.             salary:8000,
  19.             sex:undefined,
  20.         }
  21.         var jsonStr = JSON.stringify(staff);
  22.         console.log(jsonStr);
  23.         var jsonStr = JSON.stringify(staff,['department','postion']);
  24.         console.log(jsonStr);
  26.         jsonStr = JSON.stringify(staff,function(key, value){
  27.             switch (key) {
  28.                 case 'message':
  29.                     return '这是我的秘密';
  30.                     break;
  31.                 case 'salary':
  32.                     return '10000';
  33.                 default:
  34.                     return value;
  35.             }
  36.         });
  37.         console.log(jsonStr);
  38.     </script>
  39. </body>
  40. </html>

总结：js中的数组和PHP中的索引数组类似，js中的对象和PHP中的关联数组类似。json格式在前后端交互时用的非常多。

Correcting teacher：天蓬老师天蓬老师

Correction status：qualified

Teacher's comments：js中要记忆的东西比php多太多, 一定要多写多记,没有捷径
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