javascript延时重复执行函数lLoopRun.js_javascript技巧

 function lLoopRun(sFuncLoop,sFuncEnd,nDelay) {
//writen by http://fengyan.iecn.cn

//sFuncLoop >> 字符串型，需要重复执行的Javascript函数或语句（多个函数或语句请用;分隔）
//sFuncEnd >> 字符串型，用于中止重复执行动作（sFuncLoop）的Javascript函数或语句
//nDelay >> 数字型，重复执行的时间间隔（毫秒数）
var vintervalId = null;
var runString = sFuncLoop;
var stopString = sFuncEnd;
var delayTime = nDelay;
//var nCount = 0;//执行次数//为便于测试，应用时就将此行注释掉
this._doLoop = function (){
if (vintervalId && !eval(stopString)){
eval(runString);
//nCount++;//记录执行次数//为便于测试，应用时就将此行注释掉
} else {
window.clearInterval(vintervalId);
vintervalId = null;
}
//document.getElementById("TestCount").innerHTML = nCount;//输出执行次数//为便于测试，应用时就将此行注释掉
}
window.clearInterval(vintervalId);
vintervalId = window.setInterval(this._doLoop,delayTime);
}

几个实例代码：
水平往复运动:

执行次数：0

function chgPos(sId,n){
var o = document.getElementById(sId);
o.style.left = (parseInt(o.style.left)+n)+"px";
}

function chgPosStop(sId,nMax){
var o = document.getElementById(sId);
if(parseInt(o.style.left)<0){isReBack = false;}
if(parseInt(o.style.left)>nMax){isReBack = true;}
if(isReBack) {
nNum=-Math.abs(nNum);
} else {
nNum=Math.abs(nNum);
}
}

var nNum=10;
var isReBack = false;
lLoopRun("chgPos(’IECN’,nNum);","chgPosStop(’IECN’,600)",20);
-->

自动伸缩大小:

执行次数：0

function chgPos(sId,n){
var o = document.getElementById(sId);
o.width = (parseInt(o.width)+n);
}

function chgPosStop(sId,nMax){
var o = document.getElementById(sId);
if(parseInt(o.width)<10){isReBack = false;}
if(parseInt(o.width)>nMax){isReBack = true;}
if(isReBack) {
nNum=-Math.abs(nNum);
} else {
nNum=Math.abs(nNum);
}
//return parseInt(o.style.left)>nMax || (parseInt(o.style.top)>nMax-200);
}

var nNum=10;
var isReBack = false;
lLoopRun("chgPos(’IECN’,nNum);","chgPosStop(’IECN’,500)",20);
-->

垂直往复运动:

执行次数：0

function chgPos(sId,n){
var o = document.getElementById(sId);
o.style.top = (parseInt(o.style.top)+n)+"px";
}

function chgPosStop(sId,nMax){
var o = document.getElementById(sId);
if(parseInt(o.style.top)<0){isReBack = false;}
if(parseInt(o.style.top)>nMax){isReBack = true;}
if(isReBack) {
nNum=-Math.abs(nNum);
} else {
nNum=Math.abs(nNum);
}
//return parseInt(o.style.top)>nMax || (parseInt(o.style.top)>nMax-200);
}

var nNum=10;
var isReBack = false;
lLoopRun("chgPos(’IECN’,nNum);","chgPosStop(’IECN’,300)",20);
-->

渐变显示(图片):

执行次数：0

刷新再次查看演示效果

function chgOpacity(sId,n){
var o = document.getElementById(sId);
if (o.filters) {
o.filters[0].Opacity = parseInt(o.filters[0].Opacity) + n;
} else {
o.style.opacity= eval(document.defaultView.getComputedStyle(o,null).getPropertyValue(’opacity’)) + (n*100/10000);
}
}

function chgOpacityStop(sId){
var o = document.getElementById(sId);
if (o.filters) {
return parseInt(o.filters[0].Opacity)>=99;
} else {
return eval(o.style.opacity)>=0.99;
}
}

lLoopRun("chgOpacity(’IECN’,1);","chgOpacityStop(’IECN’)",20);
-->

原文：http://fengyan.iecn.cn/blog-html-do-showone-uid-35653-type-blog-itemid-2320.html