原生js

进制转换方法：string.toString(number)//number为要转换的进制数

eg:

var a = parseInt(125).toString(10);
console.log(a);//7d

应用：rgb转换成‘#000’格式：

eg:

var rgbString = $('header').css('backgroundColor'); // get this in whatever way.
var parts = rgbString.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
console.log(parts)
delete (parts[0]);
for (var i = 1; i <= 3; ++i) {
    parts[i] = parseInt(parts[i]).toString(16);
    if (parts[i].length == 1){
        parts[i] = '0' + parts[i];
    }
}
var hexString = '#' + parts.join(''); // "#0070ff"
console.log(hexString)

类名：

为

元素添加 class:

document.getElementById("D").classList.add("m");

为

元素添加多个类:

document.getElementById("D").classList.add("m", "an", "thi");

为

元素移除一个类:

document.getElementById("D").classList.remove("m");

为

元素移除多个类:

document.getElementById("D").classList.remove("m", "an", "thi");

检查是否含有某个CSS类

myDiv.classList.contains('myC'); //return true or false