写个方法近似计算指定数组或对象占用内存的大小

Answer 1

   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
       }
   }

• 参考文章