[英]Displaying image from array in Javascript in setTimeInterval method
我在暫停圖像時有點困難,因此它被渲染了。 我將圖像存儲在array
偶數索引中(例如:2、4、6)。 並使用for loop
,我想每2秒更改一次圖像。 在HTML頁面的負載上,我onLoad = executeOnLoad() in HTML
調用onLoad = executeOnLoad() in HTML
。 該圖像從默認更改為第六索引中的圖像,但此后沒有更改。 盡管控制台說i
正在更改,但它仍保持在相同的索引上。
function executeOnLoad(){
for(var i = 0; i < 7; i++){
if (i%2 == 0) {
console.log("started.."+i);
displayImage(i);
}
}
}
function displayImage(i){
console.log("displaying...." + i);
document.getElementById("initial_image").src = contentArray[i];
}
window.setInterval("executeOnLoad()", 1000);
這是控制台輸出, 每1秒重復一次,但是圖像沒有變化 :
started..0
displaying....0
started..2
displaying....2
started..4
displaying....4
started..6
displaying....6 < ---- The image here is displayed but, not changing to other..
我感謝您的幫助。 謝謝。
我為您創建了一個小提琴,可以顯示偶數。 我使用了if
語句而不是for
循環,因為那樣可以一次性運行所有循環。
看到它在這里工作:
var contentArray = ["0.png","1.png","2.png","3.png","4.png","5.png","6.png","7.png","8.png"] var i = 0; var numberOfImagesToDisplay = 6; var speedOfAnimation = 1000; function executeOnLoad(){ if(i <= numberOfImagesToDisplay){ if (i%2 == 0) { displayImage(i); i = i+2; } else { i++; } } else { i=0; displayImage(i); } } function displayImage(img){ document.getElementById("initial_image").src = "http://www.marcelogil.com/fiddle/jsloop/" + contentArray[img]; } window.setInterval("executeOnLoad()", speedOfAnimation);
<img src="http://www.marcelogil.com/fiddle/jsloop/0.png" id="initial_image" />
看到此代碼,進行一些小的更改。 間隔內沒有循環,只有一個動作。 每次調用setInterval回調時(即每隔一秒鍾),它就會進一步前進一步,直到達到所需的最大長度(即7,但應該為contentArray.length
),然后間隔會自行清除。 由於可以在聲明var interval = window.setInterval(...)
時保存對它的引用( var interval = window.setInterval(...)
並使用clearInterval
方法,因此可以清除間隔。
var i = 0, interval;
function executeOnLoad(){
i++;
if (i%2 == 0) {
console.log("started.."+i);
displayImage(i);
}
if (i >= 7) {
clearInterval(interval);
}
}
function displayImage(i){
console.log("displaying...." + i);
document.getElementById("initial_image").src = contentArray[i];
}
interval = window.setInterval(executeOnLoad, 1000);
您的代碼中沒有暫停。 該循環僅遍歷您的所有圖像,因此只有最后一個會“粘住”。
您可以使用settimeout
解決此問題:
console.clear();
document.body.innerHTML = '';
//START
var contentArray = [
'https://pixabay.com/static/uploads/photo/2015/10/01/21/39/background-image-967820_960_720.jpg',
'https://pixabay.com/static/uploads/photo/2016/01/14/01/41/image-view-1139204_960_720.jpg',
'https://i.vimeocdn.com/video/552738927_1280x720.jpg',
'https://pixabay.com/static/uploads/photo/2015/10/01/21/39/background-image-967820_960_720.jpg',
'https://pixabay.com/static/uploads/photo/2016/01/14/01/41/image-view-1139204_960_720.jpg',
'https://i.vimeocdn.com/video/552738927_1280x720.jpg',
'https://pixabay.com/static/uploads/photo/2015/10/01/21/39/background-image-967820_960_720.jpg',
'https://pixabay.com/static/uploads/photo/2016/01/14/01/41/image-view-1139204_960_720.jpg',
'https://i.vimeocdn.com/video/552738927_1280x720.jpg',
'https://pixabay.com/static/uploads/photo/2015/10/01/21/39/background-image-967820_960_720.jpg',
'https://pixabay.com/static/uploads/photo/2016/01/14/01/41/image-view-1139204_960_720.jpg',
'https://i.vimeocdn.com/video/552738927_1280x720.jpg',
'https://pixabay.com/static/uploads/photo/2015/10/01/21/39/background-image-967820_960_720.jpg',
'https://pixabay.com/static/uploads/photo/2016/01/14/01/41/image-view-1139204_960_720.jpg',
'https://i.vimeocdn.com/video/552738927_1280x720.jpg',
'https://pixabay.com/static/uploads/photo/2015/10/01/21/39/background-image-967820_960_720.jpg',
'https://pixabay.com/static/uploads/photo/2016/01/14/01/41/image-view-1139204_960_720.jpg',
'https://i.vimeocdn.com/video/552738927_1280x720.jpg',
'https://pixabay.com/static/uploads/photo/2015/10/01/21/39/background-image-967820_960_720.jpg',
'https://pixabay.com/static/uploads/photo/2016/01/14/01/41/image-view-1139204_960_720.jpg',
'https://i.vimeocdn.com/video/552738927_1280x720.jpg'
]
var initImg = document.createElement("img");
initImg.id = "initial_image";
initImg.src = '';
document.body.appendChild(initImg);
function executeOnLoad() {
for (var i = 0; i < 7; i++) {
if (i % 2 == 0) {
(function (a) {
setTimeout(function () {
console.log("started.." + a);
displayImage(a);
}, 1000 * (a + 1))
})(i);
}
}
}
function displayImage(i) {
console.log("displaying...." + i, contentArray[i]);
document.getElementById("initial_image").src = contentArray[i];
}
executeOnLoad();
檢查一下:
var i = 0; var contentArray = []; contentArray.push('https://img.utdstc.com/icons/256/beautiful-life-quotes-android.png'); contentArray.push('https://img.utdstc.com/icons/monospace-android.png'); contentArray.push('https://img.utdstc.com/icons/cloud-print-android.png'); contentArray.push('https://img.utdstc.com/icons/120/desire-the-game-for-couples-android.png'); function displayImage(){ console.log("displaying...." + i); if(i < ((contentArray.length) - 1)){ i++; }else{ i = 0; } document.getElementById("initial_image").src = contentArray[i]; window.setTimeout( displayImage, 4000); } displayImage();
<img id="initial_image"/>
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