SOURCE

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

writeDocument("最大值最小值---------------")
writeDocument("最大值："+Math.max(1,3,9,10,18,999));
writeDocument("最大值："+Math.min(1,3,9,10,18,999));

writeDocument("生成四位数随机验证码--------------------")

function generateVerifyCode(length){
    var strletterNumber="0123456789ABCDEFGHIJKLMNOPQRSTUVWSYZ"
    var code="";
    for(var i=0;i<length;++i){
            var randomNumber =Math.floor(Math.random()*strletterNumber.length);
            code=code+strletterNumber.charAt(randomNumber);
    }
    return code;
}

writeDocument(generateVerifyCode(4));

writeDocument("生成随机的颜色 rgb(255, 255, 255)----------------")
function rgb(){
			var r = Math.floor(Math.random()*256);
			var g = Math.floor(Math.random()*256);
			var b = Math.floor(Math.random()*256);
			var rgb = '('+r+','+g+','+b+')';
			return rgb;
		}
writeDocument(rgb());