1 <html> 2 <head> 3 <title>enter</title> 4 <script language="javascript"> 5 function keypress1() //text输入长度处理 6 { 7 var text1 = document.getElementById("mytext1").value; 8 var len = 15 - text1.length; 9 var show = "你还可以输入" + len + "个字"; 10 document.getElementById("name").innerText = show; 11 } 12 function keypress2() //textarea输入长度处理 13 { 14 var text1 = document.getElementById("myarea").value; 15 var len; //记录剩余字符串的长度 16 if (text1.length >= 300) //textarea控件不能用maxlength属性，就通过这样显示输入字符数了 17 { 18 document.getElementById("myarea").value = text1.substr(0, 300); 19 len = 0; 20 } else { 21 len = 300 - text1.length; 22 } 23 var show = "你还可以输入" + len + "个字"; 24 document.getElementById("pinglun").innerText = show; 25 } 26 </script> 27 </head> 28 <body> 29 <center> 30 <div style="text-align:left;"> 31 <h3>昵称:</h3> 32 <input type="text" id="mytext1" maxlength=15 onKeyUp="keypress1()" /> 33 <font color="gray"><label id="name">你还可以输入15个字</label></font> 34 <h3>评论内容:</h3> 35 <br> 36 <textarea id="myarea" style="height:100px;200px;overflow-x:hidden;overflow-y:hidden" 37 onKeyUp="keypress2()" onblur="keypress2()"> 38 </textarea> 39 <font color="gray"><label id="pinglun">你还可以输入300个字</label></font> 40 <div> 41 </center> 42 </body> 43 </html>
此代码来自网络收集，非本博主原创