选择字符数控制：
复制代码代码如下：
<文本区域名称=“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 =“描述”名称=“userModel.description”行=“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) "></文本区域>