按字符数控制：

复制代码 代码如下:

<textarea name="gbContent"

onkeyup="if(this.value.length>2000) this.value=this.value.substr(0,2000)"

onkeydown="if(this.value.length>2000) this.value=this.value.substr(0,2000)"

onblur="if(this.value.length>2000) this.value=this.value.substr(0,2000)"

onpropertychange= "if(this.value.length>2000) this.value=this.value.substr(0,2000)"></textarea>

按字节数控制：

复制代码 代码如下:

<textarea cols="50" id="description" name="userModel.description" rows="5"

onkeydown="key1=this.value;value1 = key1.replace(/[u4e00-u9fa5]/g,' ');if(value1.length>500) this.value=this.value.substr(0,500)"

onkeyup="key1=this.value;value1 = key1.replace(/[u4e00-u9fa5]/g,' ');if(value1.length>500) this.value=this.value.substr(0,500)"

onblur="key1=this.value;value1 = key1.replace(/[u4e00-u9fa5]/g,' ');if(value1.length>500) this.value=this.value.substr(0,500)"

onchange="key1=this.value;value1 = key1.replace(/[u4e00-u9fa5]/g,' ');if(value1.length>500) this.value=this.value.substr(0,500)"></textarea>