Using JS to implement jquery's AddClass, Removeclass, hasclass function _javascript skills

Nonsense not much to say that directly on the code

Copy Code code as follows:

function addclass (obj, CLS) {
var Obj_class = obj.classname,//Gets the class content.
Blank = (Obj_class!= ")? ":"//To determine whether the acquired class is empty, and add a ' space ' to the front if it is not empty.
Added = Obj_class + blank + cls;//combines the original class and the class that needs to be added.
Obj.classname = added;//replaces the original class.
}

function Removeclass (obj, CLS) {
var obj_class = ' +obj.classname+ '; Get the class content and add a space to the end. EX) ' ABC BCD '-> ' abc BCD '
Obj_class = Obj_class.replace (/(\s+)/gi, ""),//replaces extra empty characters with a single space. EX) ' ABC BCD '-> ' abc BCD '
removed = Obj_class.replace (' +cls+ ', ');//Replace the class with space in the original class. EX) ' ABC BCD '-> ' BCD '
removed = Removed.replace (/(^\s+) | ( \s+$)/g, "")//Remove the trailing space. Ex) ' BCD '-> ' BCD '
Obj.classname = removed;//replaces the original class.
}

function Hasclass (obj, CLS) {
var Obj_class = obj.classname,//Gets the class content.
Obj_class_lst = Obj_class.split (/\s+/);//The CLS is converted to an array by a split null character.
x = 0;
for (x in Obj_class_lst) {
if (obj_class_lst[x] = = CLS) {//loop array, determining whether to include CLS
return true;
}
}
return false;
}