SOURCE

function writeDocument(variable) {
    document.write(variable + "<br/>");
}

writeDocument("生成随机验证码----------");

function generateVerifyCode(length){
    var strValue ="1234567890QWTKDSCNHJFJFXVNM";
    var code ="";
    for(var i = 0;i<length;++i)
    {
        var randomIndex = Math.floor(Math.random()*strValue.length)
        code += strValue.charAt(randomIndex);
    }
    return code;
}

writeDocument(generateVerifyCode(4));
writeDocument(generateVerifyCode(5));
writeDocument(generateVerifyCode(6));


writeDocument("用Math的方法找出3, 9, 12, 99, 45, 78中的最大值和最小值-------------");

var a = Math.max(3, 9, 12, 99, 45, 78);
var b = Math.min(3, 9, 12, 99, 45, 78);

writeDocument("3, 9, 12, 99, 45, 78最大值为"+ a);
writeDocument("3, 9, 12, 99, 45, 78最小值为"+ b);


writeDocument("请随机生成一个颜色值rgb(X, Y, Z)的函数,其中X，Y，Z表示的是0~255的数字---");