**1. Get a single checkbox check (three ways to write it) **$(” input: the checkbox checked ”). The val () or $(” input: [type = ‘checkbox’] : checked ”). The val (); or $(” input: [name = ‘ck’] : checked ”). The val ();

**Get multiple checkbox checks **$(’ input: the checkbox). Each (function () {               If ($(this). Attr (” checked ”) = = true) {                               Alert ($(this). Val ());               } });

**3. Set the first checkbox to the selected value **$(’ input: the checkbox: first). Attr (” checked ”, “checked”); or $(’ input: the checkbox). Eq (0). The attr (” checked ”, “true”);

**4. Set the last checkbox to the selected value **$(’ input: radio: the last). Attr (’ checked ’, ‘checked’); or $(’ input: radio: the last). Attr (’ checked ’, ‘true’);

**Set any checkbox to the selected value based on the index value **$(’ input: the checkbox). Eq (index). Attr (’ checked ’, ‘true’); Index = 0,… or $(’ input: radio). Slice (1, 2). Attr (’ checked ’, ‘true’);

**Check multiple checkboxes check the first and second checkbox at the same time **$(’ input: radio). Slice (0, 2). The attr (” checked ”, “true”);

**7. Set the checkbox as the selected Value according to the Value **$(” input “checkbox (value = ‘1’]”). The attr (’ checked ’, ‘true’);

**8. Delete the checkbox with Value=1 **$(” input “checkbox (value = ‘1’]”). The remove ();

**9. Delete the checkbox **$(“input:checkbox”).eq(index value).remove(); Index = 0,… For example, delete the third checkbox: $(” input: the checkbox ”). Eq. (2), remove ();

**Walk through the checkbox **$(’ input: the checkbox). Each (function (index, domEle) { // write code });

**11. Select all **$(’ input: the checkbox). Each (function () {               $(this). Attr (” checked ”, true); });

**12. Cancel all choices **$(’ input: the checkbox). Each (function () {               $(this). Attr (” checked ”, false); });