检查 Array 在 Javascript 中是否具有精确的 Key Value 对象
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/21538322/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Check if Array has exact Key Value object in Javascript
提问by Spittal
I'm doing a simple check to see if this array has an exact key value pair.
我正在做一个简单的检查，看看这个数组是否有一个精确的键值对。
for example
例如
testArray = [
{ "key1": "value1" },
{ "key2": "value2" },
{ "key1": "value2" )
]
How do I check to see if the array contains the exact object { "key1" : "value2" }?
如何检查数组是否包含确切的对象 { "key1" : "value2" }？
Thanks for the help.
谢谢您的帮助。
回答by Matt
In modern browsers,
在现代浏览器中，
testArray.some(function(o){return o["key1"] === "value2";})
will be trueif pair is found, otherwise false.
将true如果对被发现，否则false。
This assumes each object contains only one key/value pair, and that the value is never undefined.
这假设每个对象只包含一个键/值对，并且该值是 never undefined。
回答by talemyn
You first want to check to see if the key exists in the object (using .hasOwnProperty()) ANDif that key values references a "value" value that matches the one that you are looking for. Teh code is pretty straightforward:
您首先要检查对象中是否存在键（使用.hasOwnProperty()），以及该键值是否引用了与您要查找的值匹配的“值”值。代码非常简单：
var testKey = "some_key";
var testVal = "some_val";
for (i=0; i < testArray.length; i++) {
if ((testArray[i].hasOwnProperty(testKey)) && (testArray[i][testKey] === testVal)) {
// positive test logic
break; // so that it doesn't keep looping, after finding a match
}
else {
// negative test logic
}
}
