defineproperty

问题 As you know we can define getters and setters in JS using defineProperty() . I've been stuck when trying to extend my class using defineProperty() . Here is an example code: I have an array of fields which must be added to a object fields = ["id", "name", "last_login"] Also I have a class which will be modified var User = (function(){ // constructor function User(id, name){ this.id = id this.name = name } return User; })(); And a function which will add fields to the class using

问题 I have downloaded the sample 'Breeze 0.83.5' applications from http://www.breezejs.com/documentation/download The Angular 'ToDo' sample does not work with IE8. I have included the following script references above my Breeze script reference. Any idea why this doesn't work? 回答1: Breeze's Angular support makes use of the 'backingStoreAdapter' which in turn depends on the ES5 Javascript 'defineProperty' method being implemented by the browser. This was not implemented in IE8, and unfortunately,

问题 I looked around for how to use the Object.defineProperty method, but couldn\'t find anything decent. Someone gave me this snippet of code: Object.defineProperty(player, \"health\", { get: function () { return 10 + ( player.level * 15 ); } }) But I don\'t understand it. Mainly, the get is what I can\'t get (pun intended). How does it work? 回答1: Since you asked a similar question, let's take it step by step. It's a bit longer, but it may save you much more time than I have spent on writing this

问题 Does anyone know what version of JavaScript is used by HTA files. Currently creating some script files - and trying to make use of Object.defineProperty When running as an HTA - it errors stating that Object doesn\'t support this property or method. I\'ve run it as an HTM file just to check - and there is no problem at all. So I can only assume that mshta.exe is using an older JavaScript engine. Can any one confirm this? 回答1: The used JavaScript (or JScript) version depends on three things: