判断window.open打开的页面是否成功；judge whether window.open is blocked or not.

isWindowOpenBlocked.js

/**
 * 判断window.open打开页面是否被拦截
 * @return {boolean} true表示被拦截，false表示未被拦截
 */
function isWindowOpenBlocked() {
    var isBlocked = false;
    try {
        var winRef = window.open(URL, WINDOWNAME[, WINDOWFEATURES]);
        if(winRef == null) {  // 浏览器拦截
            isBlocked = true;
        }
    } catch (e) {
        isBlocked = true;  // 插件、应用拦截
    }
    return isBlocked;
}