Jquery inArray（）方法在Jquery对象中查找类

Question

Suppose I have a Jquery Object $('.class0 .class1 .class2...') . I want to check if a class .classX is in this object. How can I do this? I don't think inArray() is not adapted

In the same time, just to make things clearer for me, if I have a Jquery Object $('.class0, .class1, .class2, ...') if I want to check if a class .classX is in this object, I should use inArray() method, right?

Answer 1

如果jQuery对象中有一组元素，则可以使用filter() ：

var isInside = $(".class0, .class1, .class2, ...").filter(".classX").length > 0;

Answer 2

Use .hasClass() .

var hasClass = $obj.hasClass("classX");

Notice there no dot ( . ) character prefixing classX .

Answer 3

$('.class0, .class1, .class2').is('.class2');

小提琴