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Created Jan 20, 2015
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function log(url, callback) {
// 防止请求被垃圾回收
var image = new Image(),
id = "_tbtx_" + Math.random();
window[id] = image;
image.onload = image.onerror = function() {
window[id] = null;
if (callback) {
image.src = url;
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