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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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