textarea controls the number of input character bytes (sample code)_javascript skills

Control by number of characters:

Copy code The code is as follows:

onkeyup="if(this.value.length>2000) this.value=this. value.substr(0,2000)"<br> onkeydown="if(this.value.length>2000) this.value=this.value.substr(0,2000)"<br> onblur="if(this. value.length>2000) this.value=this.value.substr(0,2000)"<br> onpropertychange= "if(this.value.length>2000) this.value=this.value.substr(0,2000 )">

Control by number of bytes:

Copy code The code is as follows:

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