this.type.toLowerCase:null; if(type=='input'&&inputType=="text"||inputType=="password"){ this.maxLength=max; }else if (type=="textarea") { this.onkeypress=function(e){ var obj=e||event; var keyCode=obj.keyCode; this.onkeyup=function(){ if (this.value.length>max) { this.value=this.value.substring(0,max); } } } } }) }; $("#btn").click(function(){ var vMaxLen=$("input#txt").val(); var iMaxLen=parseInt(vMaxLen); $("#txtarea").maxLength(iMaxLen); $("#log").html($("#log").html()+"<p>"+"最大字符个数设定为:"+vMaxLen+"个"+"</p>"); }); });
</script> </head> <body> <p> <b>最大输入字符个数</b> <input type="text" id="txt" style="width: 32px;" value="10"/> </p> <p> <input type="button" id="btn" value="限制文本域中字符的个数"/> </p> <div> <textarea rows="" cols="" id="txtarea" name="maxLenTextarrea"></textarea> </div> <div id="log"> <p>日志记录:</p> </div>