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[最佳答案] JavaScript has a limited concept of constants. For maximum compatibility at time of writing, make them variables. To stop polluting the global namespace, you could make them properties of an object. var constants = { 'constant1': 'value1', 'constant2': 'value2' }; You would then access them like constants.constant1. Many browsers' implementations of JavaScript have constants, used with const. See const Browser Compatibility on MDN for the latest browser support You could also modify the first e

[最佳答案] The problem here has to do with how an Object's keys are set. From MDN: Parameters nameValuePair1, nameValuePair2, ... nameValuePairN Pairs of names (strings) and values (any value) where the name is separated from the value by a colon. value Any value. An object's values can be accessed (via the appropriate key) in three ways: var o = {}; var key = "fun"; // method 1: o[key] = "the key will be equal to `key.toString()" // method 2: o.key = "the key will be equal to 'ke

[最佳答案] In a very simple way :-) foreach(string character in this.alphabeticChars) if(text.ToLower().Contains(character)) return true; Or maybe you can do a regular expression which is more efficient

[最佳答案] Use element.addEventListener("eventName", callbackFunction, false) and element.removeEventListener("eventName", callbackFunction). Where eventName is the name of the handler without the 'on'. So onsubmit becomes submit. For documentation of the two functions, see: https://developer.mozilla.org/en/DOM/element.addEventListener https://developer.mozilla.org/en/DOM/element.removeEventListener