使用Javascript将运算符(+、-、*、/)应用于东部阿拉伯数字

class EANum extends Number{
     constructor(){
         super();
         this.value=arguments[0];
     }
    valueOf(){
       return  Number( this.value.replace(/[٠١٢٣٤٥٦٧٨٩]/g,(d)=> d.charCodeAt(0) - 1632).replace(/[۰۱۲۳۴۵۶۷۸۹]/g, (d)=> d.charCodeAt(0) - 1776));
    }
    toString(){
       return this.valueOf();
    }

}

var a=new EANum('٣٤'),b=new EANum('١١');
console.log(a); // 
console.log(a+b); //45
console.log(a-b); //23
console.log(a*b); //374

function evalArabic(expr) {
  var fn = new Function(
    'return (' + expr.replace(/[٠١٢٣٤٥٦٧٨٩]/g, function(c) {
      return c.charCodeAt(0) - 0x660;
    }) + ')'
  );  
  return fn();
}

console.log(evalArabic('١٢٣ + ١١٢'));
console.log(evalArabic('١٢٣ - ١١٢'));
console.log(evalArabic('Ù¢ * Ù£'));
console.log(evalArabic('Ù¡ === Ù¢'));

// this one is bad:
// console.log(evalArabic('alert("p4wn3d! lol")'));