主要通过在赋值后直接.trigger('input')
可以看这个：https://blog.csdn.net/qq_35087256/article/details/79552624

<input type="text" value="江城子" class="input"><!-- 遮罩层--><div id="loadingBg"><ul id="wait"><li>老夫聊发少年狂</li><li>左牵黄</li><li>右擎苍</li><li>锦帽貂裘</li><li>千骑卷平冈</li></ul></div>

<style>/*遮罩层*/#loadingBg {position: fixed;top: 0;left: 0;width: 100%;height: 100%;background: rgba(0, 0, 0, 0.5);z-index: 1000;display: none;}#loadingBg #wait {position: absolute;top: 50%;left: 50%;width: 240px;max-height: 140px;transform: translate(-50%, -50%);background-color: #fff;padding: 20px 10px;box-sizing: border-box;overflow-y: auto;}ul,li {list-style: none;}li {line-height: 30px;color: crimson;}li:nth-child(even){color: rgb(88, 61, 139);}</style>

<script>$('.input').click(function () {$('#loadingBg').css("display", "block").on('click', function (e) {$(this).css("display", "none");if (e.target.nodeName.toLowerCase() === 'li') {var text = e.target.innerText$('.input').val(text).trigger('input', text)}})})// $('.input').on('input', function (e, msg) {//   console.log('oninput', msg)// })$(".input").bind("input propertychange",function (e,msg) {console.log("已经输入了"+$(".input").val().length+"个字。。。"+'......'+ msg);});</script>