1：试着编写一个arrayMerge()函数，实现该函数被调用时，传递任意数量的数组，返回一个合并后的数组。
function arrMerge(){
var res=[];
for(var i=0;i<arguments.length;i++)
{
res = res.concat(arguments[i]);
}
return res;
}
var value=[1,2,3,4,5];
var values=[6,7,8,9];
console.log(arrMerge(value,values));
2：实现一个定时器的页面
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>倒计时</title> <style> #box { background-color: black; border-radius: 5px; padding: 5px 10px; display: flex; -webkit-display: flex; color: white; justify-content: space-between; align-items: center; width: 240px; height: 40px; box-sizing: border-box; } #box span, #box div { width: 20%; text-align: center; } #box div { position: relative; overflow: hidden; height: 100%; } #item1, #item2 { display: block; position: absolute; left: 0; right: 0; margin: auto; } </style> </head> <body> <div id="box"> <span id="day"></span> : <span id="hour"></span> : <span id="minute"></span> : <div id="second"> <span id="item1"></span> <span id="item2"></span> </div> </div> <script> var timer; var date = new Date('3/30/2018'); function move() { var now = new Date(); var count = date - now; console.log(count); if(count <= 0) { timer = null; } var time = calculate(count); console.log(time); document.getElementById('day').innerHTML = (time.day < 10) ? ('0' + time.day) : time.day; document.getElementById('hour').innerHTML = (time.hour < 10) ? ('0' + time.hour) : time.hour; document.getElementById('minute').innerHTML = (time.minute < 10) ? ('0' + time.minute) : time.minute; var item1 = document.getElementById('item1'); var item2 = document.getElementById('item2'); item1.innerHTML = time.second + 1; item2.innerHTML = time.second; item2.style.top = (Math.floor(time.ms / 100)*3) + 'px'; item1.style.top = (Math.floor(time.ms / 100)*3-30) + 'px'; timer = setTimeout(move, 100); } function calculate(count) { var result = { day: 0, hour: 0, minute: 0, second: 0, ms: 0 }; result.ms = count % 1000; count = (count - result.ms) / 1000; if(!count) { return result; } result.second = count % 60; count = (count - result.second) / 60; if(!count) { return result; } result.minute = count % 60; count = (count - result.minute) / 60; if(!count) { return result; } result.hour = count % 24; count = (count - result.hour) / 24; result.day = count; return result; } move(); </script> </body> </html>