What are the different ranges of 2 variants of JavaScript

1.javascript How to select a checkbox, how to set it invalid?

Document.all.cb1[0].disabled = true; What are the commands of the 3 pop-up message reminders in 2.js (Warning window, confirmation window, Information Entry window)? What is the difference between the 2 variable ranges of alert confirm prompt 3.javaScript? Global variables: Valid local variables within the current page: valid within Method 4. Enumerates 3 main data types for JavaScript, 2 composite data types, and 2 special data types. Primary data type: String, Boolean, number compound data type: function, object 5.innerhtml,innertext,outerhtml,innertext the difference? InnerHTML Sets or gets the htmlouterhtml settings within the start and end tags of the object, or gets the HTML form of the object and its contents innertext set or gets the text outertext settings (including labels) located within the start and end tags of the object, or gets ( Excluding tags) The text of an object is mainly distinguished by: 1), innerHTML, and outerhtml the HTML that is included when setting the object's content is parsed, and innertext and outertext do not. 2), when set, innerHTML and innertext only set the text within the label, while outerHTML and Outertext set the text including the label.

What are the different ranges of 2 variants of JavaScript