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function generateRandomString(len) {
var randomString = "";
for (; randomString .length < len; randomString += Math.random().toString(36).substr(2));
return randomString.substr(0, len);
};
alert(generateRandomString(25));
201603061520_《Javascript生成随机字符串函数(可用于加密)》
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原文地址:http://www.cnblogs.com/beesky520/p/5247569.html