<html> <head> <meta charset="UTF-8"> <title></title> <style> body{ margin: 0; padding: 0; } div{ position: absolute; top: 200px;/*div的y轴*/ left: 150px;/*div的x轴*/ width: 300px; height: 200px; background-color: gray; } div:hover{ cursor: move; } </style> <script> /* * 分析： * 获取鼠标实时移动的坐标；m_move_x,m_move_y * 鼠标按下时的坐标；m_down_x,m_down_y * div的坐标；dx,dy * 鼠标按下时，鼠标与div的偏移量；md_x,md_y * div的新坐标；ndx,ndy */ var isDown = false;//记录鼠标状态 var move_div ;//要操作的div对象 var m_move_x,m_move_y,m_down_x,m_down_y,dx,dy,md_x,md_y,ndx,ndy; //鼠标按下 function down(){ move_div = document.getElementById("move_div"); isDown = true; //获取鼠标按下时坐标 m_down_x = event.pageX; m_down_y = event.pageY; //获取div坐标 dx = move_div.offsetLeft; dy = move_div.offsetTop; //获取鼠标与div偏移量 md_x = m_down_x - dx; md_y = m_down_y - dy; } //鼠标移动 function move(){ move_div = document.getElementById("move_div"); //实时更新div的坐标 dx = move_div.offsetLeft; dy = move_div.offsetTop; //获取鼠标移动实时坐标 m_move_x = event.pageX; m_move_y = event.pageY; //鼠标按下时移动才触发 if(isDown){ //获取新div坐标，鼠标实时坐标 - 鼠标与div的偏移量 ndx = m_move_x - md_x; ndy = m_move_y - md_y; //把新div坐标值赋给div对象 move_div.style.left = ndx+"px"; move_div.style.top = ndy+"px"; } } //鼠标释放 function up(){ isDown = false; } </script> </head> <body> <div onmousedown="down()" onmouseup="up()" onmousemove="move()"></div> </body> </html>
使用javaScript实现鼠标拖拽事件
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