几种常用常看的知识点

1.es6中新增number.isInteger  检验是否为整数

console.log(Number.isInteger(3));// true
console.log(Number.isInteger(3.2));// false

2.生成随机字符串

function generateRandomAlphaNum(len) {
    var rdmString = "";
    for (; rdmString.length < len; rdmString += Math.random().toString(36).substr(2));
    return rdmString.substr(0, len);
}
console.log(generateRandomAlphaNum(6));//随机生成的6位字符串 5x7o4l