Question

我有两个json对象，我想将它们相互比较。两者具有相同的值但是顺序不同。现在我在名为angular.equals()的角度中找到了这个有用的函数，它告诉我对象是否相同，但是我试图找出一种方法，这个函数忽略了值的顺序。例如< / p>

编辑代码

var obj = {{name: "Product 1"}, {name:"Product 2"}, {name:"Product 3"}}
var obj2= {{name: "Product 2"}, {name:"Product 1"}, {name:"Product 3"}}

正如您所看到的，它们的值相同，只是它们的顺序不同。有没有办法让角度忽略顺序？

Answer 1

你可以使用Lodash的_.isEqual()

示例：

// Extract metadata from the image
Metadata metadata = ImageMetadataReader.readMetadata(image);

// Iterate through any XMP directories we may have received
for (XmpDirectory xmpDirectory : metadata.getDirectoriesOfType(XmpDirectory.class)) {

    // Usually with metadata-extractor, you iterate a directory's tags. However XMP has
    // a complex structure with many potentially unknown properties. This doesn't map
    // well to metadata-extractor's directory-and-tag model.
    //
    // If you need to use XMP data, access the XMPMeta object directly.
    XMPMeta xmpMeta = xmpDirectory.getXMPMeta();

    // Iterate XMP properties
    XMPIterator itr = xmpMeta.iterator();
    while (itr.hasNext()) {
        XMPPropertyInfo property = (XMPPropertyInfo) itr.next();

        // Print details of the property
        System.out.println(property.getPath() + ": " + property.getValue());
    }
}

对于纯JavaScript，还有另一个问题：How to compare arrays in JavaScript?

另一种选择是比较字符串：

var arr1 = ["Product 1", "Product 2", "Product 3"];
var arr2 = ["Product 2", "Product 1", "Product 3"];

_.isEqual(arr1, arr2);

Answer 2

angular.equals(["Product 1", "Product 2", "Product 3"].sort(), ["Product 2", "Product 1", "Product 3"].sort());

请注意，数组已排序，否则将返回false（以及lodash）。此函数会忽略哈希键。

如果数组项是复杂的对象，我们可以通过对象属性对数组进行排序，传递给 sort 函数我们的比较函数：

sort(function (a, b) {
  // our comparison code (a.id against b.id for example)
})

angular.equals([{name: "Product 1"}, {name:"Product 2"}, {name:"Product 3"}].sort(function(a,b){return a.name > b.name}), [{name: "Product 2"}, {name:"Product 1"}, {name:"Product 3"}].sort(function(a,b){return a.name > b.name}))

将返回true

Angular Json比较

2 个答案: