UUID字符串使用
1.可以生成唯一的字符串标示,在发送请求中可能会用到
function uuid(num) { var s = []; var hexDigits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; for (var i = 0; i < num; i++) { s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1); } s[14] = "4"; s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1); s[8] = s[13] = s[18] = s[23] = "-"; var uuid = s.join(""); return uuid; }