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触摸开始的回调
设置当触摸开始时的回调,并回调坐标值
function(number x,number y,number screenX,number screenY,View v,number time) ---x:触摸点在视图中的x轴坐标 ---y:触摸点在视图中的y轴坐标 ---screenX:触摸点在屏幕中的x轴坐标 ---screenY:触摸点在屏幕中的y轴坐标 ---v:触摸事件回调的视图 ---time:触摸事件时间 end