本文實例講述了JavaScript比較兩個對象是否相等的方法。分享給大家供大家參考。具體如下：
在Python中可以通過cmp()內建函數來比較兩個對象所包涵的數據是否相等（數組、序列、字典）。但是在javascript語言中并沒有相關的實現。本js代碼通過對js對象進行各方面的比較來判斷兩個對象是否相等
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 不相同希望本文所述對大家的javascript程序設計有所幫助。
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