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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
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 undefinedif ( ! y.hasOwnProperty( p ) ) { return false;}// If they have the same strict value or identity then they are equalif ( x[ p ] === y[ p ] ) { continue;}// Numbers, Strings, Functions, Booleans must be strictly equalif ( typeof( x[ p ] ) !== "object" ) { return false;}// Objects and Arrays must be tested recursivelyif ( ! Object.equals( x[ p ], y[ p ] ) ) { return false;}} } for ( p in y ) {// allows x[ p ] to be set to undefinedif ( 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
希望本文所述对大家的javascript程序设计有所帮助。