1. Find by id
document.getElementById();
Support: All major browsers
2. Find by label name
document.getElementsByTagName (); // tag name; Elements plus S, it is selected from an array of classes;
Support: All major browsers
3. Find by name property
document.getElementsByName (); // name attribute, the label may be part; Elements plus S, it is selected from an array of classes;
Support: All major browsers
4. Find by class property
document.getElementsByClassName (); // class; Elements plus S, it is selected from the class of the array; IE9 does not support the following;
Support: IE9 +
5.1 Press selector selects (return document that match a specified selector element)
document.querySelector();
Support: IE8 +
5.2 Press selector to select (Back to return all elements)
document.querySelectorAll()
Support: IE8 +
5.3 selector parameter (CSS selectors: https://www.runoob.com/cssref/css-selectors.html )
| parameter | Types of | description |
| CSS selectors | String | have to. Specify one or more matching elements CSS selectors. Thereof may be used id, class, type, attributes, attribute values, etc. to select elements. A plurality of selectors, separated by commas, returns a matching element. |