jQuery / JS objects each conversion

A, js objects into jQuery Object: Use $ () DOM object to wrap up;

　　var v = document.getElementById ( "v"); // js objects

　　var $ v = $ (v); // jQuery objects

Two, jQuery objects into js objects:

　　( 1 ) Since jQuery a dummy array, with [index] Method obtained:

　　　　var $ v = $ ( "# v"); // jQuery objects;

　　　　var v = $ v [0]; // js subject;

　　　　alert (v.checked) // detect whether the checkbox is checked;

　　( 2 ) by jQuery itself .get (index) Method:

　　　　var $ v = $ ( "# v"); // jQuery objects;

　　　　var v = $ v.get (0); // js subject;

　　　　alert (v.checked) // detect whether the checkbox is checked;