在 javascript 中,我需要知道数组是否包含值。值是对象,我可以拥有同一对象的不同实例,这意味着 $.inArray(...) 将不起作用。我知道如何使用 $.each(...) 来完成我的任务,我的问题是 - 是否可以将具有值比较逻辑的函数传递给任何 jQuery 方法(参见带有所需 sintax 的示例)?
// values
var val1 = { id: 1, description: 'First value'};
var val2 = { id: 2, description: 'Second value'};
var val3 = { id: 3, description: 'Third value'};
// array of values
var values = [ val1, val2, val3 ];
// inArray of jQuery to know if value is in array -> returns TRUE
var isInArray = $.inArray(val2, values) > -1;
// another instance of same object "val2"
var val2_anotherInstance = { id: 2, description: 'Second value'};
// inArray works as expected -> returns FALSE but desirable result is TRUE
var isInArray_anotherInstance = $.inArray(val2_anotherInstance, values) > -1;
// define function for comparing values (any logic can be implemented, for example searching by Id)
var valueComparer = function(first, second) {
return first.id == second.id && first.description == second.description;
}
// function compares objects and returns true for different instances
alert(valueComparer(val2, val2_anotherInstance));
// desirable sintax:
// is something like this possible ???
// NOTE next line not correct
isInArray_anotherInstance = $.inArray(val2_anotherInstance, values, valueComparer) > -1;
// actually what I want is specify criteria for searching value in array