js生成随机数（数字+大小写字母）

代码如下：

// 生成四位随机数generateMixed(n) {var chars = ["0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z","a","b","c", "d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y",        "z"];var res = "";for (var i = 0; i < n; i++) {var id = Math.floor(Math.random() * 62);res += chars[id];}return res;}generateMixed(4);// 2mhc

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js生成随机数（数字+大小写字母）

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