按字符數控制：

復制代碼 代碼如下:

<textarea 
             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>

復制代碼 代碼如下:

<textarea cols="50" 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>