要看的话看cesium的js哈，我这给你你找一个我们范例有的。
这个是PickPosition.html里面单击的示范：
var handler = new Cesium.ScreenSpaceEventHandler(scene.canvas);
//设置鼠标左键单击回调事件
handler.setInputAction(function(e) {
//首先移除之前添加的点
viewer.entities.removeAll();
//获取点击位置笛卡尔坐标
var position = scene.pickPosition(e.position);
//将笛卡尔坐标转化为经纬度坐标
var cartographic = Cesium.Cartographic.fromCartesian(position);
var longitude = Cesium.Math.toDegrees(cartographic.longitude);
var latitude = Cesium.Math.toDegrees(cartographic.latitude);
var height = cartographic.height;
if(height < 0) {
height = 0;
}
//创建弹出框信息
var entity = new Cesium.Entity({
name : "位置信息",
description : createDescription(Cesium, [longitude, latitude, height])
});
viewer.selectedEntity = entity;
//在点击位置添加对应点
viewer.entities.add(new Cesium.Entity({
point : new Cesium.PointGraphics({
color : new Cesium.Color(1, 1, 0),
pixelSize : 10,
outlineColor : new Cesium.Color(0, 1, 1)
}),
position : Cesium.Cartesian3.fromDegrees(longitude, latitude , height + 0.5)
}));
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
以下是cesium.js的文档搜索结果（https://cesiumjs.org/refdoc/）：
ScreenSpaceEventType
ScreenSpaceEventType()
Core/ScreenSpaceEventType.js 12
This enumerated type is for classifying mouse events: down, up, click, double click, move and move while a button is held down.
Members
staticconstantCesium.ScreenSpaceEventType.LEFT_CLICK : Number
Core/ScreenSpaceEventType.js 35
Represents a mouse left click event.
staticconstantCesium.ScreenSpaceEventType.LEFT_DOUBLE_CLICK : Number
Core/ScreenSpaceEventType.js 43
Represents a mouse left double click event.
staticconstantCesium.ScreenSpaceEventType.LEFT_DOWN : Number
Core/ScreenSpaceEventType.js 19
Represents a mouse left button down event.
staticconstantCesium.ScreenSpaceEventType.LEFT_UP : Number
Core/ScreenSpaceEventType.js 27
Represents a mouse left button up event.
staticconstantCesium.ScreenSpaceEventType.MIDDLE_CLICK : Number
Core/ScreenSpaceEventType.js 91
Represents a mouse middle click event.
staticconstantCesium.ScreenSpaceEventType.MIDDLE_DOWN : Number
Core/ScreenSpaceEventType.js 75
Represents a mouse middle button down event.
staticconstantCesium.ScreenSpaceEventType.MIDDLE_UP : Number
Core/ScreenSpaceEventType.js 83
Represents a mouse middle button up event.
staticconstantCesium.ScreenSpaceEventType.MOUSE_MOVE : Number
Core/ScreenSpaceEventType.js 99
Represents a mouse move event.
staticconstantCesium.ScreenSpaceEventType.PINCH_END : Number
Core/ScreenSpaceEventType.js 123
Represents the end of a two-finger event on a touch surface.
staticconstantCesium.ScreenSpaceEventType.PINCH_MOVE : Number
Core/ScreenSpaceEventType.js 131
Represents a change of a two-finger event on a touch surface.
staticconstantCesium.ScreenSpaceEventType.PINCH_START : Number
Core/ScreenSpaceEventType.js 115
Represents the start of a two-finger event on a touch surface.
staticconstantCesium.ScreenSpaceEventType.RIGHT_CLICK : Number
Core/ScreenSpaceEventType.js 67
Represents a mouse right click event.
staticconstantCesium.ScreenSpaceEventType.RIGHT_DOWN : Number
Core/ScreenSpaceEventType.js 51
Represents a mouse left button down event.
staticconstantCesium.ScreenSpaceEventType.RIGHT_UP : Number
Core/ScreenSpaceEventType.js 59
Represents a mouse right button up event.
staticconstantCesium.ScreenSpaceEventType.WHEEL : Number
