zixin’s blog

// Create a user-defined object.
var obj = {};

// Add a data property.
obj.newDataProperty = "abc";

// Get the property descriptor.
var descriptor = Object.getOwnPropertyDescriptor(obj, "newDataProperty");

// Change a property attribute.
descriptor.writable = false;
Object.defineProperty(obj, "newDataProperty", descriptor);

var _createClass = (function() {
    function defineProperties(target, props) {
        for (var i = 0; i < props.length; i++) {
            var descriptor = props[i];
            descriptor.enumerable = descriptor.enumerable || false;
            descriptor.configurable = true;
            if ('value' in descriptor) descriptor.writable = true;
            Object.defineProperty(target, descriptor.key, descriptor);
        }
    }
    return function(Constructor, protoProps, staticProps) {
        if (protoProps) defineProperties(Constructor.prototype, protoProps);
        if (staticProps) defineProperties(Constructor, staticProps);
        return Constructor;
    };
})();