JavaScript比较两个对象是否相等的方法

本文实例讲述了JavaScript比较两个对象是否相等的方法。分享给大家供大家参考。具体如下：

在Python中可以通过cmp()内建函数来比较两个对象所包涵的数据是否相等（数组、序列、字典）。但是在javascript语言中并没有相关的实现。本js代码通过对js对象进行各方面的比较来判断两个对象是否相等

rush:js;"> cmp = function( x,y ) { // If both x and y are null or undefined and exactly the same if ( x === y ) { return true; }

// If they are not strictly equal,they both need to be Objects
if ( ! ( x instanceof Object ) || ! ( y instanceof Object ) ) {
return false;
}

//They must have the exact same prototype chain,the closest we can do is
//test the constructor.
if ( x.constructor !== y.constructor ) {
return false;
}

for ( var p in x ) {
//Inherited properties were tested using x.constructor === y.constructor
if ( x.hasOwnProperty( p ) ) {
// Allows comparing x[ p ] and y[ p ] when set to undefined
if ( ! y.hasOwnProperty( p ) ) {
return false;
}

// If they have the same strict value or identity then they are equal
if ( x[ p ] === y[ p ] ) {
continue;
}

// Numbers,Strings,Functions,Booleans must be strictly equal
if ( typeof( x[ p ] ) !== "object" ) {
return false;
}

// Objects and Arrays must be tested recursively
if ( ! Object.equals( x[ p ],y[ p ] ) ) {
return false;
}
}
}

for ( p in y ) {
// allows x[ p ] to be set to undefined
if ( y.hasOwnProperty( p ) && ! x.hasOwnProperty( p ) ) {
return false;
}
}
return true;
};

使用：

rush:js;"> objA={ a:'123',b:'456' }; objB={ a:'123',b:'000' }; var isEqual= cmp(objA,objB); console.log(isEqual); // false 不相同

希望本文所述对大家的javascript程序设计有所帮助。

原文地址：https://www.jb51.cc/js/55862.html