Web front-end JS uses window.print() to implement local printing (self test available)

<div id="printPage">Print the content</div>
<button class="btn-common btn-search" @click="btn_sendmsg" id="print-btn">print</button>
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var newstr = document.getElementById("printPage").innerHTML;// The id you want to print
var oldstr = document.body.innerHTML;
document.body.innerHTML = newstr;
window.print();
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That will do