写个方法近似计算指定数组或对象占用内存的大小

   function sizeOfObject(obj)){       if(object == null){return 0       }       var bytes = 0       for (var key in obj) {if (!Object.hasOwnProperty.call(obj, key)) {    continue}bytes += sizeof(key)try {    bytes += sizeof(obj[key])} catch (ex) {    if (ex instanceof RangeError) {        bytes = 0    }}       }       return bytes   }   function sizeOf(obj){       var objType = typeof obj       switch(objType){case 'string':    return obj.length*3;case 'boolean'    return 1;case 'number':    return 8;case 'object':    if(Array.isArray(obj)){        return obj.map(sizeOf).reduce(acc,curr)=>acc+curr,0)    }else{        return sizeOfObject(obj)    }default:    return 0       }   }

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