1. Mobile terminal touch screen event

        touch Object represents a touch point . The touch point could be a finger , It could be a stylus . Touch screen events respond to user fingers （ Or a stylus ） Operation of the screen or touch pad .

touchstart	Fingers touch a DOM Element trigger
touchmove	Finger in a DOM Triggered when sliding on an element
touchmove	Fingers from a DOM Triggered when the element is moved up

 var div = document.querySelector('div');
       div.addEventListener('touchstart',function(){
           console.log(' Touched ');
       })

        TouchEvent It's a class that describes a finger on a touch plane （ Touch screen 、 Touchpad, etc ） The state of change of events . This type of event is used to describe one or more contacts , Enables developers to detect the movement of contacts , The increase and decrease of contacts , wait

        touchstart、touchmove、touchmove Each has its own event object .

Three common object lists

touches	A list of all fingers touching the screen
targetTouches	Touching the current DOM A list of fingers on the element
changedTouches	List of finger states that have changed , From scratch , From have to no

div.addEventListener('touchstart',function(e){

           console.log(e);

       })

console.log(e.targetTouches[0]);// You can get what you are touching dom Information about the first finger of the element , Such as finger coordinates 

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