照搬github上面的东西了 

 

can not bring up keyboard instantly in ios 11.3  

 

FastClick.prototype.focus = function(targetElement) {
 var length;
// Issue #160: on iOS 7, some input elements (e.g. date datetime month) throw a vague TypeError on setSelectionRange. These elements don't have an integer value for the selectionStart and selectionEnd properties, but unfortunately that can't be used for detection because accessing the properties also throws a TypeError. Just check the type instead. Filed as Apple bug #15122724.
 if (deviceIsIOS && targetElement.setSelectionRange && targetElement.type.indexOf('date') !== 0 && targetElement.type !== 'time' && targetElement.type !== 'month') {
  length = targetElement.value.length;
     targetElement.focus();
  targetElement.setSelectionRange(length, length);
 } else {
  targetElement.focus();
 }
};

 

在这个原型方法下 加入  targetElement.focus();    

 

 

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