javaScript native get DOM elements

JS native acquired DOM element method (8 types)

• Acquiring the ID (the getElementById)
• Get (getElementsByName) by the name attribute
• Get (getEleByTagName) by the tag name
• Get (getEmentsByClassName) by Class class name
• Obtaining an element (querySelector) by the selector
• Obtaining a set of elements (querySelectAll) by the selector
• Methods (document.documentElement) Gets the HTML
• The method of obtaining body (document.body): dedicated to acquiring the label body used

Get the syntax elements introduced by the selectors:

//通过选择器获取一个元素
document.querySelector(".animated");
//通过选择器获取一组元素
document.querySelectorAll(".animated");