为什么时间是十秒刷新一次的

Question

/** * Created by Administrator on 2016/5/25. */var WINDOW_WIDTH=1200;var WINDOW_HEIGHT=600;var RADIUS=8;var MARGIN_LEFT=30;var MARGIN_TOP=60;const endTime=new Date(2016,4,31,21,36,36);var curShowTimeSeconds=0;window.onload=function(){    var canvas=document.getElementById('canvas');    var context=canvas.getContext("2d");    canvas.width=WINDOW_WIDTH;    canvas.height=WINDOW_HEIGHT;    curShowTimeSeconds=getCurrentShowTimeSeconds();    //render(context);    setInterval(        function () {            render(context);            update();        }        ,        50    );};function update() {    var nextShowTimeSeconds=getCurrentShowTimeSeconds();    var nextHours=parseInt(nextShowTimeSeconds/3600);    var nextMinutes=parseInt((nextShowTimeSeconds-nextHours*3600)/60);    var nextSeconds=nextShowTimeSeconds%60;    var curHours=parseInt(curShowTimeSeconds/3600);    var curMinutes=parseInt((curShowTimeSeconds-curHours*3600)/60);    var curSeconds=curShowTimeSeconds%60;    if(nextSeconds!=curSeconds){        curShowTimeSeconds=nextShowTimeSeconds;    }}function getCurrentShowTimeSeconds() {    var curTime=new Date();    var ret=endTime.getTime()-curTime.getTime();    ret=Math.round(ret/1000);    return ret>=0?ret:0;}function render(cxt) {    cxt.clearRect(0,0,WINDOW_WIDTH,WINDOW_HEIGHT);    var hours=parseInt(curShowTimeSeconds/3600);    var minutes=parseInt((curShowTimeSeconds-hours*3600)/60);    var seconds=curShowTimeSeconds%60;    renderDigit(MARGIN_LEFT,MARGIN_TOP,parseInt(hours/10),cxt);    renderDigit(MARGIN_LEFT+15*(RADIUS+1),MARGIN_TOP,parseInt(hours%10),cxt);    renderDigit(MARGIN_LEFT+30*(RADIUS+1),MARGIN_TOP,10,cxt);    renderDigit(MARGIN_LEFT+39*(RADIUS+1),MARGIN_TOP,parseInt(minutes/10),cxt);    renderDigit(MARGIN_LEFT+54*(RADIUS+1),MARGIN_TOP,parseInt(minutes%10),cxt);    renderDigit(MARGIN_LEFT+69*(RADIUS+1),MARGIN_TOP,10,cxt);    renderDigit(MARGIN_LEFT+78*(RADIUS+1),MARGIN_TOP,parseInt(seconds/10),cxt);    renderDigit(MARGIN_LEFT+93*(RADIUS+1),MARGIN_TOP,parseInt(minutes%10),cxt);}function renderDigit(x,y,num,cxt) {    cxt.fillStyle="rgb(0,102,153)";    for(var i=0;i<digit[num].length;i++)        for(var j=0;j<digit[num][i].length;j++)            if (digit[num][i][j] == 1) {                cxt.beginPath();                cxt.arc(x + j * 2 * (RADIUS + 1) + (RADIUS + 1), y + i * 2 * (RADIUS + 1) + (RADIUS + 1),                    RADIUS, 0, 2 * Math.PI);                cxt.closePath();                cxt.fill();            }}

Answer 1

这个不就是 某个老师的时间倒数  很多小球掉落的教程吗? 

怎么小白我感觉你没把全部代码放上来呢;

印象中是有这么一段代码  setInterval ("update()",1000);

我建议你如果是用sublimetext 软件编程你可以按CTRL +F  搜索setInterval 这样你就可以找到 setInterval ("XXX()",1000);的代码

Answer 2

对啊  但是还没写到小球那里   就写的时间改变的