JSFiddle - React, Tailwind, and code Playground

HTML

<input id="cht-text" type="text" value="哈囉" /><button id="cht-button">按我測試中文字</button>
<br />
<input id="eng-text" type="text" value="Hello" /><button id="eng-button">按我測試英文字</button>

JavaScript

// 中文驗證
function isChinese ( str ) {
      var regx = /[^\u4e00-\u9fa5]/;
      if ( regx.test( str ) ){
        return false;
      } else {
        return true;
      }
}


//按鈕事件綁定
$('#cht-button').on('click', function(){
   alert( isChinese ($('#cht-text').val() ) );
}); 
$('#eng-button').on('click', function(){
   alert( isChinese ($('#eng-text').val() ) );
});