这里是我工作的模块:模块内部简单的函数调用,拿到NaN,呵呵?
var FeatureRotator = (function($,global) {
var self = {},
currentFeature = 0,
images = [],
imagePrefix = "/public/images/features/",
timer = null,
totalImages = 0,
initialFeature,
interval,
blendSpeed,
element = null,
img1 = null,
img2 = null;
function setVisibleImage(iid) {
$("#img1").attr('src',images[iid].src).css('opacity',1);
$("#img2").css('opacity',0);
$(".active").removeClass("active");
$("#f"+iid).addClass("active");
}
function setCurrentImage(id) {
currentFeature = id;
setVisibleImage(id);
}
function doHoverIn(position) {
if (currentFeature === position) {
self.pause();
} else {
setCurrentImage(global.parseInt(position, 10));
self.pause();
}
}
function doHoverOut(position) {
self.unpause();
}
self.init = function(options,callback) {
var i = 0,
tempImg = null;
interval = options.interval || 5000;
blendSpeed = options.blendSpeed || 500;
element = options.element;
initialFeature = options.initialFeature || 0;
img1 = $("<img/>").attr('id','img1');
img2 = $("<img/>").attr('id','img2').css('opacity','0').css('margin-top',-options.height);
$(element).append(img1).append(img2);
totalImages = $(".feature").size();
for (i = 0;i < totalImages; i++) {
tempImg = new global.Image();
tempImg.src = imagePrefix +"feature_" + i + ".png";
images.push(tempImg);
$("#f"+i).css('background-image',
'url("'+imagePrefix+"feature_"+i+"_thumb.png"+'")')
.hover(doHoverIn($(this).attr('position'))
, doHoverOut($(this).attr('position'))
).attr('position',i);
}
setVisibleImage(initialFeature);
if (options.autoStart) {
self.start();
}
if (callback !== null) {
callback();
}
};
function updateImage() {
var active = $("#img1").css('opacity') === 1 ? "#img1" : "#img2";
var nextFeature = (currentFeature === totalImages-1 ? 0 : currentFeature+1);
if (active === "#img1") {
$("#img2").attr('src',images[nextFeature].src);
$("#img2").fadeTo(blendSpeed, 1);
$("#img1").fadeTo(blendSpeed, 0);
} else {
$("#img1").attr('src',images[nextFeature].src);
$("#img1").fadeTo(blendSpeed, 1);
$("#img2").fadeTo(blendSpeed, 0);
}
$("#f"+currentFeature).removeClass("active");
$("#f"+nextFeature).addClass("active");
currentFeature = nextFeature;
}
self.start = function() {
currentFeature = initialFeature;
setVisibleImage(currentFeature);
timer = global.setInterval(function(){
updateImage();
}, interval);
};
self.pause = function() {
global.clearTimeout(timer);
};
self.unpause = function() {
timer = global.setInterval(function(){
updateImage();
}, interval);
};
return self;
}(this.jQuery, this));
这里是它是如何在页面上使用:
<script type="text/javascript">
// ...
$(function() {
FeatureRotator.init({
interval:5000,
element:'#intro',
autoStart:true,
height:177,
blendSpeed:1000,
initialFeature:0
});
});
</script>
的问题是,当setVisibleImage从init方法调用, iid的价值是NaN。当调用setVisibleImage函数时,我已经遍历调试器并验证'initialFeature'为0,但是,值不会使它在那里。
任何人都可以帮助我确定问题是什么?我通过JSLint运行了代码,并且它恢复了干净。
UPDATE
确定这里是我更新的代码,现在该功能除了衰落不工作,像正好翻转到下一个,平稳了不褪色:
var FeatureRotator = (function($,global) {
var self = {},
currentFeature = 0,
images = [],
imagePrefix = "/public/images/features/",
timer = null,
totalImages = 0,
initialFeature = 0,
interval,
blendSpeed;
function setVisibleImage(iid) {
$("#img1").attr('src',images[iid].src).css('opacity',1);
$("#img2").css('opacity',0);
$(".active").removeClass("active");
$("#f"+iid).addClass("active");
}
function setCurrentImage(id) {
currentFeature = id;
setVisibleImage(id);
}
function doHoverIn(obj) {
var position = global.parseInt(obj.target.attributes["position"].value,10);
if (currentFeature === position) {
self.pause();
} else {
setCurrentImage(global.parseInt(position, 10));
self.pause();
}
}
function doHoverOut() {
self.unpause();
}
self.init = function(options,callback) {
var i = 0,
tempImg = null,
element = null,
img1 = null,
img2 = null;
interval = options.interval || 5000;
blendSpeed = options.blendSpeed || 500;
element = options.element;
initialFeature = options.initialFeature || 0;
img1 = $("<img/>").attr('id','img1');
img2 = $("<img/>").attr('id','img2').css('opacity','0').css('margin-top',-options.height);
$(element).append(img1).append(img2);
totalImages = $(".feature").size();
for (i = 0;i < totalImages; i++) {
tempImg = new global.Image();
tempImg.src = imagePrefix +"feature_" + i + ".png";
images.push(tempImg);
$("#f"+i).css('background-image','url("'+imagePrefix+"feature_"+i+"_thumb.png"+'")')
.hover(doHoverIn, doHoverOut)
.attr('position',i);
}
setVisibleImage(initialFeature);
if (options.autoStart) {
self.start();
}
if (typeof callback === "function") {
callback();
}
};
function updateImage() {
var active = $("#img1").css('opacity') === 1 ? "#img1" : "#img2";
var nextFeature = (currentFeature === totalImages-1 ? 0 : currentFeature+1);
if (active === "#img1") {
$("#img2").attr('src',images[nextFeature].src);
$("#img2").fadeTo(blendSpeed, 1);
$("#img1").fadeTo(blendSpeed, 0);
} else {
$("#img1").attr('src',images[nextFeature].src);
$("#img1").fadeTo(blendSpeed, 1);
$("#img2").fadeTo(blendSpeed, 0);
}
$("#f"+currentFeature).removeClass("active");
$("#f"+nextFeature).addClass("active");
currentFeature = nextFeature;
}
self.start = function() {
currentFeature = initialFeature;
setVisibleImage(currentFeature);
timer = global.setInterval(function(){
updateImage();
}, interval);
};
self.stop = function() {
global.clearTimeout(timer);
};
self.pause = function() {
global.clearTimeout(timer);
};
self.unpause = function() {
timer = global.setInterval(function(){
updateImage();
}, interval);
};
return self;
}(this.jQuery, this));
你是否在调用setVisibleImage()之前检查`initialFeature`的值? – 2011-02-04 20:11:18