JS Table element checked, radio selected several methods (detailed) _javascript skills

0. Environment

<input type= "checkbox" value= "LOL"/>lol

var lol = document.getelementsbytagname ("input") [0];

1, HTML DOM

A.lol.checked = true;

The value of the property can be not lol, as long as it is true when converted to a Boolean value, only true, false two when the value is taken

No checked markup added

B.lol.click ();

The checked tag is not incremented, then the lol.checked value is True

2. DOM Core

Lol.setattribute ("Checked", "checked");

Element adds a checked tag, then the lol.checked value is True

<input type= "checkbox" checked= "checked" value= "LOL"/>lol

In fact, checked tag, the existence of the application, the following wording can be implemented by default selected

<input type= "checkbox" checked value= "LOL"/>lol

Selected by default when the browser parses text.

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