form中限制文本字节数js代码_表单特效

/*
value: 值；
byteLength：数据库字节长度
title：字段中文名称
attribute：属性名称
使用方法说明：

添加 （1） onkeyup="limitLength(this.value,100,'名称','name')"
(2) id="name" 或【struts标签】styleId="name"
注意：id名称和 attribute属性名称要一样

例子： <br><br> 或 <br><br><input type="text" name="explain" id="explain" onkeyup="limitLength(value,5,'语义说明','explain')" > <br><br>*/ <br><br><br><br>function limitLength(value, byteLength, title, attribute) { <BR> var newvalue = value.replace(/[^\x00-\xff]/g, "**"); <BR> var length = newvalue.length; <br><br> //当填写的字节数小于设置的字节数 <BR> if (length * 1 <=byteLength * 1){ <BR> return; <BR> } <BR> var limitDate = newvalue.substr(0, byteLength); <BR> var count = 0; <BR> var limitvalue = ""; <BR> for (var i = 0; i < limitDate.length; i++) { <BR> var flat = limitDate.substr(i, 1); <BR> if (flat == "*") { <BR> count++; <BR> } <BR> } <BR> var size = 0; <BR> var istar = newvalue.substr(byteLength * 1 - 1, 1);//校验点是否为“×” <br><br> //if 基点是×; 判断在基点内有×为偶数还是奇数 <BR> if (count % 2 == 0) { <BR> //当为偶数时 <BR> size = count / 2 + (byteLength * 1 - count); <BR> limitvalue = value.substr(0, size); <BR> } else { <BR> //当为奇数时 <BR> size = (count - 1) / 2 + (byteLength * 1 - count); <BR> limitvalue = value.substr(0, size); <BR> } <BR> alert(title + "最大输入" + byteLength + "个字节（相当于"+byteLength /2+"个汉字）！"); <BR> document.getElementById(attribute).value = limitvalue; <BR> return; <BR>} </div> <div class=""> <ul class="m-news-opt fix"> <li class="opt-item"> <a href='/JavaScript-233549.html' target='_blank'><p>< 上一篇</p><p class="ellipsis">從博客網扣了一個效果出來_图象特效</p></a> </li> <li class="opt-item ta-r"> <a href='/JavaScript-233551.html' target='_blank'><p>下一篇 ></p><p class="ellipsis">javascriptZifaFormValid0.1表单验证代码打包下载_表单特效</p></a> </li> </ul> </div> </div> </div> <div class="g-title fix"> <h2 class="title-txt">人气教程排行</h2> </div> <div class="m-rank u-dashed mb40"> <ul> <li class="rank-item"> <a href="/JavaScript-60002.html" title='vue2 设置router-view默认路径的实例' class="item-name ellipsis" target="_blank"> <span class="g-art-count fr">213次</span> <span class="g-sort-num top">1</span> vue2 设置router-view默认路径的实例 </a> </li> <li class="rank-item"> <a href="/JavaScript-56926.html" title='Vue-路由导航菜单栏的高亮设置方法' 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