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