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- // Example 1
- var x = 1; // 宣告、初始化 x
- var y; // 宣告 y
- console.log(x + " " + y); // '1 undefined'
- y = 2; // 初始化 y
- // Example 2
- var x = 1; // 宣告、初始化 x
- y = 2; // 初始化 y
- console.log(x + " " + y); // '1 2'
- var y; // 宣告 y
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