JavaScript控製圖片載入完成後調用回呼函數的方法_javascript技巧

本文執行個體講述了JavaScript控製圖片載入完成後調用回呼函數的方法。分享給大家供大家參考。具體分析如下：

這段代碼可以控制指定地區內的圖片載入完成後執行指定的回呼函數。

複製代碼 代碼如下:

function when_images_loaded($img_container, callback) {
/* do callback when images in $img_container (jQuery object) are loaded. Only works when ALL images in $img_container are newly inserted images and this function is called immediately after images are inserted into the target. */
    var _imgs = $img_container.find('img'),
        img_length = _imgs.length,
        img_load_cntr = 0;
    if (img_length) {//if the $img_container contains new images.
        _imgs.on('load', function() {//then we avoid the callback until images are loaded
            img_load_cntr++;
            if (img_load_cntr == img_length) {
                callback();
            }
        });
    }
    else { //otherwise just do the main callback action if there's no images in $img_container.
        callback();
    }
}

希望本文所述對大家的javascript程式設計有所協助。