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```html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <script> var a = { name: "Jack" } console.log(a.name); // Jack var b = a; console.log(b.name); // Jack b.name = "JACK"; // 赋值方式，改变一个对象另一个对象也会被改变 console.log(a.name); // JACK console.log(b.name); // JACK </script> </body> </html> ```