1. 设置定时器
语法:setInterval(函数,时间)
注意:
函数书写时不能带括号
setInterval(fn,1000)//正确 setInterval(fn(),1000)//错误时间的最小设置不小于14ms
2. 清除定时器
语法:clearInterval(所清除的定时器名称)
3. 实例探究
js部分
window.onload =function() { vartimer =null; varnum = 0; vari = 0; vararr=["red","#FF9D0C","#DBFF0D","#3BFF0D","#0DFFA2","#0DE8FF","#0D52FF","#210DFF","#930DFF","#FF0DB4"] varstart = document.getElementById("start"); varstop = document.getElementById("stop"); varprizeDraw = document.getElementById("prizeDraw"); start.onclick =function() { clearInterval(timer); timer = setInterval(function(){ num = Math.floor(Math.random()*100+1); prizeDraw.style.backgroundColor = arr[i]; i++; if(i==9) { i = 0; }; prizeDraw.innerHTML = num; },100); } stop.onclick =function() { clearInterval(timer); } }css部分
#prizeDraw { width:100px; height:100px; background: rgba(255,68,253,0.5); font-size:30px; text-align:center; line-height:100px; }html部分
代码分析:
注意在运行定时器的时候要先清除定时器,不然如果一直点击运行定时器,定时器就会运行多个,点停也停不下来;
clearInterval()可以接受清除的值为null;
将内容存放在数组中的应用。
原文链接:http://www.cnblogs.com/huyuzhu/p/6200840.html
[javascript学习指南]javascript中定时器的实例代码
http://m.bbyears.com/jiaocheng/116438.html
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