类似新浪 腾讯微博字数统计 控制js(区分中英文 符号)
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<script> var maxstrlen = 140; function Q(s) { return document.getElementById(s); } function checkWord(c) { len = maxstrlen; var str = c.value; myLen = getStrleng(str); var wck = Q("wordCheck"); if (myLen > len * 2) { c.value = str.substring(0, i + 1); } else { wck.innerHTML = Math.floor((len * 2 - myLen) / 2); } } function getStrleng(str) { myLen = 0; i = 0; for (; (i < str.length) && (myLen <= maxstrlen * 2); i++) { if (str.charCodeAt(i) > 0 && str.charCodeAt(i) < 128) myLen++; else myLen += 2; } return myLen; } </script> </head> <body> <div style="font-size: 16px"> 控制输入框字符输入,计算输入字符总数,显示剩余字数;<br> 一个英文字符算一个字符,一个中文字符算两个字符计算。 </div> <div> <textarea onKeyUp="javascript:checkWord(this);" onKeyDown="javascript:checkWord(this);" name="content" id="content" style="overflow-y: scroll"></textarea> </div> <DIV> 还可以输入<span style="font-family: Georgia; font-size: 26px;" id="wordCheck">140</span>个字符 </div> </body>