我正在尝试构建一个Web应用程序,它将根据预定义的时间自动为用户执行JS功能。
例如:我在网页上有以下功能:
function a () {do stuff}
function b () {do some other stuff}
function c () {do other stuff}
以及每个用户加载的JSON时间轴:
"timeline":[
{"ontime":" 00:00:00,000", "execute_func":"a"},
{"ontime ":" 00:00:02,000", "execute_func":"b"},
{"ontime ":" 00:00:07,000", "execute_func":"c"},
{"ontime ":" 00:00:08,000", "execute_func":"a"},
{"ontime ":" 00:00:13,000", "execute_func":"c"}
...
]
有没有办法根据它们在时间轴"中显示的顺序和时间自动触发这些功能?
非常感谢您的任何帮助!
答案 0 :(得分:0)
您的JSON首先出现问题,这是不对的。你可以这样做得更好:
"timeline": [
{"ontime": "00:00:00,000", "execute_func": "a"},
{"ontime": "00:00:02,000", "execute_func": "b"},
{"ontime": "00:00:07,000", "execute_func": "c"},
{"ontime": "00:00:08,000", "execute_func": "a"},
{"ontime": "00:00:13,000", "execute_func": "c"}
...
]
注意键间距... ontime
之后有一个空格,不应该在那里......
您需要设置一个计时事件处理函数,该函数每秒执行一次:
setTimeout(function () {
// Execute every 1 second.
// Get the current time.
curTime = (new Date());
var curTime = ("0" + curTime.getHours()).substr(-2) + ":" + ("0" + curTime.getMinutes()).substr(-2) + ":" + ("0" + curTime.getSeconds()).substr(-2);
if (typeof getFunctionOnTime(curTime) == "function") {
getFunctionOnTime(curTime)();
}
}, 1000);
getFunctionOnTime
函数将返回该函数,否则返回false。
function getFunctionOnTime(time) {
for (var i = 0; i < timeline.length; i++) {
if (timeline[i].ontime == time) {
return (window[timeline[i].execute_func] || false);
}
}
}
上述函数假定execute_func
函数在全局或window
范围内声明。这可能不是最终的完美表现解决方案,但这是有效的。这有很大的优化范围。