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<head lang="en"><meta charset="UTF-8"><title>限制文件字数字</title>
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<span class="span">备注信息</br><span id="stay" style="display: none"> 您还可以输入:<span id="txtCount"></span>个字符的描述信息</span></span></br><input id="Remark_information" name="Remark_information" type="text"><script>var lim=new limit();lim.txtNote=document.getElementById("Remark_information");lim.txtLimit=document.getElementById("txtCount");lim.limitCount=80;lim.init();function limit(){var txtNote;//文本框var txtLimit;//提示字数的inputvar limitCount;//限制的字数var txtlength;//到达限制时，字符串的长度this.init=function(){txtNote=this.txtNote;txtLimit=this.txtLimit;limitCount=this.limitCount;txtNote.οninput=function(){wordsLimit()};txtNote.οninput=function(){wordsLimit()};txtLimit.innerText=limitCount;};function wordsLimit(){var noteCount=txtNote.value.length;var InPut=document.getElementById("Remark_information").value.length;if(InPut<1){document.getElementById("stay").style.display="none";return}if(InPut>=1){document.getElementById("stay").style.display="inline";document.getElementById("stay").style.color="green";}if(InPut>70){document.getElementById("stay").style.color="red";}if(noteCount>limitCount){txtNote.value=txtNote.value.substring(0,limitCount);txtLimit.innerText=0;}else{txtLimit.innerText=limitCount-noteCount;}txtlength=txtNote.value.length;//记录每次输入后的长度}}
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</body>来自：http://www.cnblogs.com/zhujiasheng/p/6113983.html
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