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