<script>
var?input_a=document.getElementsByClassName("input-a")[0];
var?input_b=document.getElementsByClassName("input-b")[0];
var?countdiv=document.getElementsByClassName("count")[0];
var?i_a=document.getElementsByTagName("i")[0];
var?reg=/[^\w\u4e00-\u9fa5]/g;
var?value=null;
var?selfvalue=null;
input_a.onfocus=function(){
	i_a.style.display="block";
	
	input_a.onkeyup=function(){
	var?count=countNum(this.value);
	countdiv.innerText=count?==?0??null:count+"個(gè)字符";
	
	
	if(reg.test(this.value)){
		i_a.innerText="含有非法字符!";
		i_a.className="warn?iconerror";
	}
	else?if(this.value?==?""){
		i_a.innerText="不能為空!";
		i_a.className="warn?iconerror";
	}
	else?if(this.value.length?<?5){
		i_a.innerText="不能小于五個(gè)字符!";
		i_a.className="warn?iconerror";
	}
	else?if(this.value.length?>?25){
		i_a.innerText="不能大于25個(gè)字符!";
		i_a.className="warn?iconerror";
	}
	else?if(!reg.test(this.value)){
		i_a.innerText="填寫正確哦!";
		i_a.className="warn?iconright";
	}

	
}
}





function?countNum(str){
		var?len=str.length;
		for(var?i=0;i<str.length;i++){
				if(str.charCodeAt(i)?>?255){
					len++;
				}
		}
		return?len;
}
</script>

但是總感覺(jué)哪里不對(duì)，大佬們幫我改進(jìn)一下吧