ios隐藏软键盘

 //判断是否为苹果
 var isIPHONE = navigator.userAgent.toUpperCase().indexOf('IPHONE')!= -1;

 // 元素失去焦点隐藏iphone的软键盘
 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');
     }
 }

 if(isIPHONE){
     var input = new objBlur('input_id');
     input = null;
 }