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                            ### JSON

- 什么是 JSON

- JSON 和數組

- `JSON` 和 `for in`

- 代碼：

  ```HTML
  <!DOCTYPE html>
  <html>
    <head>
      <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
      <title>程序流程控制</title>
      <script>
      window.onload = function () {
        // switch
        var i = 0;
        switch (i){
          case i*++i:
            console.log('i');
            break;
          case 1:
            console.log('1')
            break;
          default:
            console.log('default');
            break;
        }
  
        // ?:  條件?語句一:語句二
        var a = 1;
        a % 2 == 0 ? console.log('雙數'):console.log('單數');
  
        // break continue
        for (i = 0; i < 5; i++){
          if (i === 2){
            // break; // 中斷所有循環
            continue; // 中斷本次循環
          }
          console.log(i);
        }
  
        // json 和 數組
        const json = {a: 2, b: 5, c:9};
        const arr = [23, 45, 5467];
        console.log('b:', json.b, 'c:', json['c'], '沒有length', json.length);
        console.log(arr[2], arr.length);
  
        // JSON 和 for in
        for (var i in arr) {
          console.log('第' + i + '個：' + arr[i]);
        }
        for (var i in json) {
          console.log('第' + i + '個：' + json[i]);
        }
      }
      </script>
    </head>
    <body>
    </body>
  </html>
  ```

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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