<!DOCTYPE html><html><head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>JS拖拽</title> <style> *{padding: 0; margin: 0; } .box{width: 100px;height: 100px;background: blue;position: absolute; } </style> <script src="jquery.min.js"></script> <script> var isDown = false; var ObjLeft, ObjTop, posX, posY, obj,offsetX,offsetY; $(function(){ obj=$("#box"); obj.onmousedown = down; document.onmousemove = move; document.onmouseup = up; }) function down(event){ isDown=true; obj.style.cursor = "move"; ObjLeft = obj.offset().left; ObjTop = obj.offset().top; } </script> <script> var isDown = false; var ObjLeft, ObjTop, posX, posY, obj,offsetX,offsetY; window.onload = function() { obj = document.getElementById('box'); obj.onmousedown = down; document.onmousemove = move; document.onmouseup = up; } function down(event) { obj.style.cursor = "move"; isDown = true; ObjLeft = obj.offsetLeft; ObjTop = obj.offsetTop; posX = parseInt(mousePosition(event).x); posY = parseInt(mousePosition(event).y); offsetX=posX-ObjLeft; offsetY=posY-ObjTop; } function move(event) { if (isDown == true) { var x=mousePosition(event).x-offsetX; var y=mousePosition(event).y-offsetY; var w = document.documentElement.clientWidth - obj.offsetWidth; var h = document.documentElement.clientHeight - obj.offsetHeight; console.log(x + ',' + y); x=Math.min(w,Math.max(0,x)); y=Math.min(h,Math.max(0,y)); obj.style.left = x + 'px'; obj.style.top = y + 'px'; } } function up() { isDown = false; } function mousePosition(evt) { var xPos, yPos; evt = evt || window.event; if (evt.pageX) { xPos = evt.pageX; yPos = evt.pageY; } else { xPos = evt.clientX + document.body.scrollLeft - document.body.clientLeft; yPos = evt.clientY + document.body.scrollTop - document.body.clientTop; } return { x: xPos, y: yPos } } </script></head><body><div id="box" class="box"></div></body></html>
转载于:https://www.cnblogs.com/znj211985211/p/5340876.html
相关资源：javascript拖拽图片到指定位置
