<div style="background-color: #ffffff; font-family: 'Fira Code', Consolas, 'Courier New', monospace; font-size: 20px; line-height: 27px; white-space: pre;"> <div><span style="color: #008000;">// 手写一个深拷贝函数</span></div> <br /> <div><span style="color: #0000ff;">function</span> deepCopy(obj) {</div> <br /> <div>    <span style="color: #0000ff;">var</span> result = Array.isArray(obj) ? [] : {};</div> <br /> <div>    <span style="color: #0000ff;">for</span> (<span style="color: #0000ff;">var</span> key <span style="color: #0000ff;">in</span> obj) {</div> <br /> <div>        <span style="color: #0000ff;">if</span> (obj.hasOwnProperty(key)) {</div> <br /> <div>            <span style="color: #0000ff;">if</span> (<span style="color: #0000ff;">typeof</span> obj[key] === <span style="color: #a31515;">'object'</span> && obj[key] !== <span style="color: #0000ff;">null</span>) {</div> <br /> <div>                result[key] = deepCopy(obj[key]);   <span style="color: #008000;">//递归复制</span></div> <br /> <div>            } <span style="color: #0000ff;">else</span> {</div> <br /> <div>                result[key] = obj[key];</div> <br /> <div>            }</div> <br /> <div>        }</div> <br /> <div>    }</div> <br /> <div>    <span style="color: #0000ff;">return</span> result;</div> <br /> <div>}</div> </div>