JS to determine whether to select

The method of JS

Window.onload = function () {
var odiv = document.getElementById (' Div1 ');
Alert (odiv.checked)
}

True and False are returned

The second method of

$ (function () {
Alert ($ ("#div1"). Get (0). Checked)
})

Similar to the first, converted to JS native object

The third method of

$ (function () {
Alert ($ ("#div1"). Is (': Checked '))
})

Using is:checked

Fourth method

Alert ($ ("#div1"). Prop (' checked '))

The three ways jquery judges checked:
. attr (' checked)://See version 1.6+ return: "Checked" or "undefined"; 1.5-return: TRUE or False
. Prop (' checked ')://16+:true/false
. Is (': Checked ')://All Versions: true/false//don't forget the colon!
Several ways to checked jquery assignment:
All jquery versions can be assigned this way:
$ ("#cb1"). attr ("Checked", "checked");
$ ("#cb1"). attr ("Checked", true);
jquery1.6+:p 4 Types of ROP assignment:
$ ("#cb1 ″). Prop (" checked ", true);//It's easy to say OH
$ ("#cb1 ″). Prop ({checked:true}); Map Key value pairs
$ ("#cb1 ″). Prop (" Checked ", function () {
Return true;//function returns TRUE or FALSE
});
Remember this: $ ("#cb1 ″). Prop (" Checked "," checked ");

JS to determine whether to select