javascript风格的一个元素
// Getting the element first
var myElement = document.querySelector("#myElement");
// examples for updating styles
myElement.style.color = "blue";
myElement.style.backgroundColor = "red";
添加型的要素使用javascript
var elem = document.querySelector('#some-element');
// Set color to purple
elem.style.color = 'purple';
// Set the background color to a light gray
elem.style.backgroundColor = '#e5e5e5';
// Set the height to 150px
elem.style.height = '150px';