随机数Math.random()案例

1.获取六位十六进制颜色值

function getRandColor() {

var colorstr = "0123456789abcdef";

var str = "#";

for (var i = 0; i < 6; i++) {

var index = getRand(0, 15);

str += colorstr[index];

}

console.log(str);

return str;

}

getRandColor();

2.四位数字验证码

function getYZM(num) {

var yzm = "";

for (var i = 0; i < num; i++) {

var randAS = getRand(48, 122);

if ((randAS >= 48 && randAS <= 57) || (randAS >= 65 && randAS <= 90) || (randAS >= 97 && randAS <= 122)) {

yzm += String.fromCharCode(randAS);

} else {

i--;

}

}

return yzm;

}