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ts代码部分:

import React, { Component, createRef } from 'react'
import '../css/TestDrag.less'
interface Props {

}
interface State {

}
class TestDrag extends Component<Props, State>{
    disX: number = 0;
    disY: number = 0;
    x: number = 0;
    y: number = 0;
    dragElement = createRef<HTMLDivElement>();
    constructor(props: Props) {
        super(props)
        this.state = {

        }
    }
    FnDown(ev: React.MouseEvent<HTMLDivElement>): void {
        if (this.dragElement.current) {
            this.disX = ev.clientX - this.dragElement.current.getBoundingClientRect().left;
            this.disY = ev.clientY - this.dragElement.current.getBoundingClientRect().top;
        }
        document.onmousemove = this.FnMove.bind(this);
        document.onmouseup = this.FnUp;
        ev.preventDefault && ev.preventDefault()
    }
    FnMove(ev: MouseEvent) {
        this.x = ev.clientX - this.disX;
        this.y = ev.clientY - this.disY;
        if(this.dragElement.current){
            this.dragElement.current.style.left=this.x+'px';
            this.dragElement.current.style.top=this.y+'px';
            //  this.dragElement.current.style.transform = `translate(${this.x}px,${this.y}px)`
        }
       
    }
    FnUp() {
        document.onmousemove=null;
        document.onmouseup=null;
    }
    render() {
        return (
            <div ref={this.dragElement} className="testdrag" onMouseDown={this.FnDown.bind(this)}></div>
        )
    }
}
export default TestDrag;

less代码：

没有配置less的也可以用css

.testdrag{
  width: 200px;
  height: 200px;
  background-color: aqua;
  position: absolute;
}