• Email your drawing ( jpeg, png or pdf, word) with minimum 300 dpi resolution for good clarity. Product Detail * The internal thread is deep, clear and tidy, the force is uniform, and it is not easy to slip during rotation, and it is smooth a...
document.webkitHidden : document.hidden; if (isHidden) { document.removeEventListener('visibilitychange', visiChangecb); isOnceHidden = true; } }; // 由于在部分ipad上调起地图时,isHidden也为false;但是在visibilitychange事件里有时能得到正确的isHidden,有时也一直为false; // 为了提高准确性,通过...