的forEach內提供服務AngularJS

Question

Error: this.filters.forEach is not a function

.provider('searchFilter', function() { 
    this.filters = { 
    location : { 
     default: 'Boston, MA', 
     value: '' 
    }, 
    radius : { 
     default: '1', 
     value: '' 
    } 
    } 
    this.$get = function() { 
     var filters = this.returnFilters(); 
     return { 
      returnFilters: function() { 
      return filters; 
      } 
     } 
    }; 
    this.setLocation = function(location) { 
     this.filters.location.default = location; 
    }; 
    this.setRadius = function(radius) { 
     this.filters.radius.default = radius; 
    }; 
    this.returnFilters = function() { 
    this.filters.forEach(function (filter) { 
     filter.value = (filter.value=='')?filter.default:filter.value; 
    }); 
    return this.filters; 
    }; 
}); 

爲什麼不能我用forEach一個.provider服務裏面？

Answer 1

filters是一個對象，它沒有「forEach」方法。但是，您可以使用for(.. in ..)或Object.keys(..).forEach（或者我認爲是angular.each）