<body>
<input type="text" value="ios端点击document，input框不会失去焦点">
<input class="input" type="text" value="已hack，点击document可失去焦点">
<script>
window.onload = function() {
document.querySelector('body').addEventListener('touchend', function(e) {
if(e.target.className != 'input') {
document.querySelector('.input').blur();
}
});
}
</script>
</body>