手动收起ios机input的软键盘

//id是input框的id的名字，time是软键盘多少时间消失

function objBlur(id,time){
if(typeof id != 'string') throw new Error('objBlur()参数错误');
var obj = document.getElementById(id),
time = time || 300,
docTouchend = function(event){
if(event.target!= obj){
setTimeout(function(){
obj.blur();
document.removeEventListener('touchend', docTouchend,false);
},time);
}
};
if(obj){
obj.addEventListener('focus', function(){
document.addEventListener('touchend', docTouchend,false);
},false);
}else{
throw new Error('objBlur()没有找到元素');
}
}