我想向页面访问者显示一个随机图像,然后只显示同一图像到同一个访问者,直到cookie过期。如何随机运行3个javascript函数中的1个?
一切正常,但我卡在初始化。
基本上,如果没有cookie集,我需要随机运行3个函数中的1个。 我将如何去随机选择3个函数中的一个并运行它?
$(document).ready(function() {
var cookie = readCookie("boatColor");
if (!cookie) {
console.log('Run one of 3 Functions Randomly');
} else if (cookie == "boatRed") {
showRedBoat();
} else if (cookie == "boatWhite") {
showWhiteBoat();
} else if (cookie == "boatBlue") {
showBlueBoat();
}
});
function showRedBoat() {
var newSrc = "";
var myText = "";
newSrc = "https://s3-us-west-2.amazonaws.com/s.cdpn.io/500458/copeland_boat_red.jpg";
myText = "<h3>You've got the Red Boat!</h3>";
theImage.src = newSrc;
theDesc.innerHTML = myText;
createCookie("boatColor", 'boatRed', 0.00034722222);
}
function showWhiteBoat() {
var newSrc = "";
var myText = "";
newSrc = "https://s3-us-west-2.amazonaws.com/s.cdpn.io/500458/copeland_boat_white.jpg";
myText = "<h3>You've got the White Boat!</h3>";
theImage.src = newSrc;
theDesc.innerHTML = myText;
createCookie("boatColor", 'boatWhite', 0.00034722222);
}
function showBlueBoat() {
var newSrc = "";
var myText = "";
newSrc = "https://s3-us-west-2.amazonaws.com/s.cdpn.io/500458/copeland_boat_blue.jpg";
myText = "<h3>You've got the Blue Boat!</h3>";
theImage.src = newSrc;
theDesc.innerHTML = myText;
createCookie("boatColor", 'boatBlue', 0.00034722222);
}
function createCookie(name,value,days) {
if (days) {
var date = new Date();
date.setTime(date.getTime()+(days*24*60*60*1000));
var expires = "; expires="+date.toGMTString();
}
else var expires = "";
document.cookie = name+"="+value+expires+"; path=/";
}
function readCookie(name) {
var nameEQ = name + "=";
var ca = document.cookie.split(';');
for(var i=0;i < ca.length;i++) {
var c = ca[i];
while (c.charAt(0)==' ') c = c.substring(1,c.length);
if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
}
return null;
}
Codepen链接:https://codepen.io/nolaandy/pen/awgoQM
设置上的Cookie明天截止日期。 – T4rk1n
如果你的问题是如何从3个函数中随机选择1个并运行它,为什么其他代码中的任何一个都相关(你声称它的工作原理应该如此)?似乎cookie处理与问题无关。你能将代码缩减到你所问的部分吗? – trincot