HTML打印指定DIV

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思路一：创建新的窗口，在新窗口内生成div内容进行打印

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<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>打印指定区域</title>
</head>
<body>

    <div>
        <button onclick="printDiv()">打印指定内容</button>
    </div>

    <div id="printArea">
        <h2>这是需要打印的内容</h2>
        <p>这里的内容将会被打印。</p >
    </div>

    <div>
        <p>这里是不会被打印的内容。</p >
    </div>

    <script>
        function printDiv() {
            var divContent = document.getElementById("printArea").innerHTML;
            var newWindow = window.open('', '', 'width=800,height=600');
            newWindow.document.write('<html><head><title>打印</title></head><body>');
            newWindow.document.write(divContent);
            newWindow.document.write('</body></html>');
            newWindow.document.close();
            newWindow.print();
        }
    </script>

</body>
</html>

思路二：隐藏非打印区域

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<!DOCTYPE html>
<html>

<head>
    <style>
        .printview {
            background-color: #fff;
            padding: 1rem;
            min-height: calc(100vh);
        }

        @media print {
            .printview-open {
                overflow: auto !important;
            }

            .printview-open>*:not(.printview) {
                display: none !important;
            }
        }
    </style>
</head>

<body>
    <div>hello world!</div>
    <div id="pdiv" >
        print this div
        <ul>
            <li>111</li>
            <li>222</li>
            <li>333</li>
        </ul>
    </div>
    <div>
        -------
        <ul>
            <li>444</li>
            <li>555</li>
            <li>666</li>
        </ul>
    </div>

    <button onclick="div_print('pdiv')">print</button>
    <script>
        function div_print(divID) {
            var divContent = document.getElementById(divID).innerHTML;

            const printContent = divContent
            const body = document.querySelector('body')
            body.classList.add('printview-open')
            const dialog = document.createElement('div')
            dialog.classList.add('printview')
            dialog.innerHTML = printContent
            body.appendChild(dialog)
            window.print()
            setTimeout(() => {
                console.log('print dlg over');
                body.classList.remove('printview-open')
                dialog.remove()
            }, 100)
        }
    </script>
</body>

</html>