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
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:
希望本文所述对大家的javascript程序设计有所帮助。
原文链接:https://www.f2er.com/js/55862.html