<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title> <script src="jquery-3.2.1.min.js"></script> <script> $(function () { $(‘input[type="text"]‘).on(‘input‘, function (e) { var $that = $(this); var limitLen = $that .attr("maxcodelength") //定义所需字节数 $that.attr(‘maxlength‘,limitLen); setTimeout(function(){ var value = $that.val(), reg = /[\u4e00-\u9fa5]{1}/g, //中文 notReg = /\w{1}/g; //非中文 var resultCn = value.match(reg); var resultEn = value.match(notReg); if(resultCn){ limitLen = limitLen - (resultCn.length*2); } if(resultEn){ limitLen = limitLen - resultEn.length; } if(limitLen<=0){ var finalLen = value.length+limitLen; value = value.substring(0,finalLen); $that.attr(‘maxlength‘,limitLen); $that[0].value = value; } },0); }); }); </script></head><body>请输入:<input type="text" maxcodelength="10"><input type="text" maxcodelength="5"></body></html>
时间: 2024-08-07 20:10:13