blocks|key|220498|text|从您的代码判断，您似乎想要删除对象的属性，就像使用delete所做的那样|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|220499|var+obj+=+{+key:+"value"+};

delete+obj["key"];|code-block|syntax|javascript|220500|在MDN上可以找到关于在JavaScript中使用对象的非常有用的指南。|220501|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en/JavaScript/Reference/Operators/delete|1|https://developer.mozilla.org/en/JavaScript/Guide/Working_with_Objects^0|P|6|P|6|0|0|0|1|3|1|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|13|8|@]|D|@$9|14|A|15|1|16]]|E|$]]|$1|M|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]|U|$5|P|Q|R|E|$S|V]]]]

Judging by your code, it sounds like you want to delete an object's property, which you would do with <a href="https://developer.mozilla.org/en/JavaScript/Reference/Operators/delete" rel="noreferrer"><code>delete</code></a>:

<pre><code>var obj = { key: "value" };

delete obj["key"];
</code></pre>

A very useful guide on working with objects in JavaScript can be found on <a href="https://developer.mozilla.org/en/JavaScript/Guide/Working_with_Objects" rel="noreferrer">MDN</a>.

blocks|key|223631|text|array["key"]不是数组的键(+javascript中没有关联数组，如果你来自PHP，它们可能看起来像它们，但它们是对象)，而是对象的属性，我认为你可以使用delete|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|223632|delete+array.key|code-block|syntax|javascript|223633|entityMap^0|0|C|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

<code>array["key"]</code> is not the key of an array (there are no associative arrays in javascript, if you come from PHP they might look like them, but they are objects) but the property of an object, i think you can use delete

<pre><code>delete array.key
</code></pre>

blocks|key|225912|text|var+fruits+=+["Banana",+"Orange",+"Apple",+"Mango"];
fruits.splice(2,+1);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|225913|将从fruits数组中删除1项，位置2，即Apple|unstyled|offset|length|style|CODE|225914|entityMap^0|0|L|5|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@$G|O|H|P|I|J]]|9|@]|A|$]]|$1|K|3|-4|5|F|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<pre><code>var fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.splice(2, 1);
</code></pre>

will remove 1 item from array fruits, position 2, which is <code>Apple</code>

blocks|key|223657|text|对于阵列，请使用splice方法：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|223658|var+array+=+[1,+2,+3,+4,+5];
array.splice(2,+1);
console.log(array);+//+[1,+2,+4,+5]|code-block|syntax|javascript|223659|您可以创建自己的函数来删除(第一次出现的)数组中的某个元素：|223660|Array.prototype.remove+=+function(el)+{
++++return+this.splice(this.indexOf(el),+1);
}
var+arr+=+[1,+2,+3,+4,+5];
arr.remove(4);
console.log(arr);+//+[1,+2,+3,+5]|223661|如果要从object中删除项目，请使用delete语法：|CODE|223662|var+a+=+{key1:+'val1',+key2:+'val2'};
delete+a.key1;
console.log(a);+//+{key2:+'val2'}|223663|同样，您可以创建自己的函数来处理此问题：|223664|Object.prototype.remove+=+function(el)+{
++++if+(this.hasOwnProperty(el))+{
++++++++delete+this[el];
++++}
++++return+this;
}
var+a+=+{key1+:+'val1',+key2:+'val2'};
a.remove('key1');
console.log(a);+//+{key2:+'val2'}|223665|更新：|223666|223667|虽然这只是一个例子，但正如@Eric指出的那样，修改对象的原型并不是一个很好的主意。因此，我重写了不会改变对象状态的示例，|ordered-list-item|223668|添加了检查元素是否存在于数组中的检查。如果它不存在，则返回的索引将为-1，splice方法将删除最后一个元素(数组末尾的第一个元素)。谢谢，@amnotiam！|223669|223670|function+remove(collection,+key)+{
++++//+if+the+collections+is+an+array
++++if(collection+instanceof+Array)+{
++++++++if(collection.indexOf(key)+!=+-1)+{
++++++++++++collection.splice(collection.indexOf(key),+1);
++++++++}
++++}
++++//+it's+an+object
++++else+if(collection.hasOwnProperty(key))+{
++++++++delete+collection[key];
++++}
++++return+collection;
};|223671|当然，由于问题被标记为jquery，我们可以将此函数添加为jquery插件：|223672|(function($,+global,+undefined)+{
++++$.removeElementFromCollection+=+function(collection,key)+{
++++++++//+if+the+collections+is+an+array
++++++++if(collection+instanceof+Array)+{
++++++++++++//+use+jquery's+`inArray`+method+because+ie8+
++++++++++++//+doesn't+support+the+`indexOf`+method
++++++++++++if($.inArray(key,+collection)+!=+-1)+{
++++++++++++++++collection.splice($.inArray(key,+collection),+1);
++++++++++++}
++++++++}
++++++++//+it's+an+object
++++++++else+if(collection.hasOwnProperty(key))+{
++++++++++++delete+collection[key];
++++++++}

++++++++return+collection;
++++};
})(jQuery,+window);+|223673|然后像这样使用它：|223674|var+array+=+[1,+2,+3,+4,+5];
$.removeElementFromCollection(array,+2);+//+[1,+3,+4,+5]

var+object+=+{1:+2,+3:+4};
$.removeElementFromCollection(object,+1);+//+{3:+4}|223675|entityMap|0|LINK|mutability|MUTABLE|url|http://www.w3schools.com/jsref/jsref_splice.asp^0|2|2|8|6|0|0|0|0|0|4|6|J|6|0|0|0|0|0|2|0|0|0|Y|2|0|0|0|B|6|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1O|8|@$9|1P|A|1Q|B|C]]|D|@$9|1R|A|1S|1|1T]]|E|$]]|$1|F|3|G|5|H|7|1U|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1V|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|1W|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|1X|8|@$9|1Y|A|1Z|B|C]|$9|20|A|21|B|Q]]|D|@]|E|$]]|$1|R|3|S|5|H|7|22|8|@]|D|@]|E|$I|J]]|$1|T|3|U|5|6|7|23|8|@]|D|@]|E|$]]|$1|V|3|W|5|H|7|24|8|@]|D|@]|E|$I|J]]|$1|X|3|Y|5|6|7|25|8|@$9|26|A|27|B|C]]|D|@]|E|$]]|$1|Z|3|-4|5|6|7|28|8|@]|D|@]|E|$]]|$1|10|3|11|5|12|7|29|8|@]|D|@]|E|$]]|$1|13|3|14|5|12|7|2A|8|@$9|2B|A|2C|B|Q]]|D|@]|E|$]]|$1|15|3|-4|5|6|7|2D|8|@]|D|@]|E|$]]|$1|16|3|17|5|H|7|2E|8|@]|D|@]|E|$I|J]]|$1|18|3|19|5|6|7|2F|8|@$9|2G|A|2H|B|Q]]|D|@]|E|$]]|$1|1A|3|1B|5|H|7|2I|8|@]|D|@]|E|$I|J]]|$1|1C|3|1D|5|6|7|2J|8|@]|D|@]|E|$]]|$1|1E|3|1F|5|H|7|2K|8|@]|D|@]|E|$I|J]]|$1|1G|3|-4|5|6|7|2L|8|@]|D|@]|E|$]]]|1H|$1I|$5|1J|1K|1L|E|$1M|1N]]]]

For arrays use the <a href="http://www.w3schools.com/jsref/jsref_splice.asp" rel="noreferrer">splice</a> method : 

<pre><code>var array = [1, 2, 3, 4, 5];
array.splice(2, 1);
console.log(array); // [1, 2, 4, 5]
</code></pre>

You could make your own function to remove (the first occurrence of) a certain element in the array : 

<pre><code>Array.prototype.remove = function(el) {
 return this.splice(this.indexOf(el), 1);
}
var arr = [1, 2, 3, 4, 5];
arr.remove(4);
console.log(arr); // [1, 2, 3, 5]
</code></pre>

If you want to remove an item from an object, use the <code>delete</code> syntax : 

<pre><code>var a = {key1: 'val1', key2: 'val2'};
delete a.key1;
console.log(a); // {key2: 'val2'}
</code></pre>

And yet again you can make your own function to handle this : 

<pre><code>Object.prototype.remove = function(el) {
 if (this.hasOwnProperty(el)) {
 delete this[el];
 }
 return this;
}
var a = {key1 : 'val1', key2: 'val2'};
a.remove('key1');
console.log(a); // {key2: 'val2'}
</code></pre>

Update : 

<ol>
<li>Although this was just an example, as @Eric pointed out, it's not a very good idea to modify an object's prototype. So I've re-written examples that do not alter the object's state </li>
<li>Added a check if the element exists in the array. If it doesn't exist, the reeturned index would be <code>-1</code> and the splice method would remove the last element (the first element from the end of the array). Thanks, @amnotiam! </li>
</ol>

 

<pre><code>function remove(collection, key) {
 // if the collections is an array
 if(collection instanceof Array) {
 if(collection.indexOf(key) != -1) {
 collection.splice(collection.indexOf(key), 1);
 }
 }
 // it's an object
 else if(collection.hasOwnProperty(key)) {
 delete collection[key];
 }
 return collection;
};
</code></pre>

And of course, since the question was tagged <code>jquery</code>, we can add this function as a jquery plugin : 

<pre><code>(function($, global, undefined) {
 $.removeElementFromCollection = function(collection,key) {
 // if the collections is an array
 if(collection instanceof Array) {
 // use jquery's `inArray` method because ie8 
 // doesn't support the `indexOf` method
 if($.inArray(key, collection) != -1) {
 collection.splice($.inArray(key, collection), 1);
 }
 }
 // it's an object
 else if(collection.hasOwnProperty(key)) {
 delete collection[key];
 }

 return collection;
 };
})(jQuery, window); 
</code></pre>

And then use it like this : 

<pre><code>var array = [1, 2, 3, 4, 5];
$.removeElementFromCollection(array, 2); // [1, 3, 4, 5]

var object = {1: 2, 3: 4};
$.removeElementFromCollection(object, 1); // {3: 4}
</code></pre>

In jQuery/JavaScript, How do I remove an array element?

something like:

<pre><code>array.remove(array["key"]);

// or 

array.remove("value")
</code></pre>

In jquery how do I remove an array element either via index["key"] or value

jQuery

在jQuery/JavaScript，中如何删除数组元素？类似于：array.remove(array["key"]);// or array.remove("value")

问在jquery中，如何通过index["key"]或value删除数组元素
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