JavaScript 拉起 App

javascript awake App

function openApp(openUrl, callback) {
    //检查app是否打开
    function checkOpen(cb){
        var _clickTime = +(new Date());
        function check(elsTime) {
            if ( elsTime > 7000) {  // 7000 = 5000 + toast的 2000
                cb(1);
            } else {
                cb(0);
            }
        }
        //启动间隔20ms运行的定时器，并检测累计消耗时间是否超过3000ms，超过则结束
        var _count = 0, intHandle;
        intHandle = setInterval(function(){
            _count++;
            var elsTime = +(new Date()) - _clickTime;
            if (_count>=250 || elsTime > 5000 ) {
                clearInterval(intHandle);
                check(elsTime);
            }
        }, 20);
    }
    //在iframe 中打开APP
    var ifr = document.createElement('iframe');
    ifr.src = openUrl;
    ifr.style.display = 'none';
    if (callback) {
        checkOpen(function(opened){
            callback && callback(opened);
        });
    }
    document.body.appendChild(ifr);
    setTimeout(function() {
        document.body.removeChild(ifr);
    }, 2000);
}