cesium situation marking meeting (area measurement----cannot be modified)

cesium situation marking meeting (area measurement----cannot be modified)

vue + cesium area measurement and plotting, using es6 modular writing method, the logic is clear, and there will be obvious label instructions, making the code easy to read, understand and learn.

1. Create a new MeasureArea.js file (to store the drawing and plotting code)

/*
绘制面(面积测量)
 */
class MeasureArea {
   
    
    
    constructor(arg) {
   
    
    
        this.obj