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核心js代码
//字符串截取 function getByteVal(val, max) { var returnValue = ""; var byteValLen = 0; for (var i = 0; i < val.length; i++) { if (val[i].match(/[^\x00-\xff]/ig) != null) byteValLen += 2; else byteValLen += 1; if (byteValLen > max) break; returnValue += val[i]; } return returnValue; } $("#txt").bind("keyup",function(){ var val=this.value; if(val.replace(/[^\x00-\xff]/g,"**").length>14){ this.value=getByteVal(val,14) } })