<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Normal - Drag</title> <style> .modal { position: fixed; left: 0; top: 0; width: 100%; height: 100%; background-color: rgba(100, 100, 100, 0.5); z-index: 2001; } .modal-content { position: absolute; width: 500px; height: 300px; left: 50%; margin-left: -250px; margin-top: 100px; border: 10px solid rgba(150, 150, 150, 0.5); background-color: white; text-align: center; } .modal-title { height: 38px; border-bottom: 1px solid blue; text-align: left; padding: 0 10px; font-weight: bold; cursor: move; } .modal-title div { display: inline-block; font-size: larger; line-height: 2; padding: 0 8px; } .modal-title .modal-close { float: right; cursor: pointer; } .modal-title .modal-close:hover { background-color: rgb(198, 236, 236); } </style> </head> <body> <div> <p>This is backend content. This is backend content. This is backend content. This is backend content. This is backend content. This is backend content. This is backend content. 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This is backend content. </p> </div> <div id="idModal" class="modal"> <div id="idModalDetail" class="modal-content"> <div id="idModalTitle" class="modal-title"> <div>可拖动</div> <div class="modal-close">X</div> </div> <div class="modal-body">This is drag modal</div> </div> </div> <script> // 拖动时，偶发选中文本，将该选择功能禁用 function cancelUserSelect(ele) { if (!ele) return false; document.body.style.userSelect = 'none'; document.body.style.webkitUserSelect = 'none'; document.body.style.msUserSelect = 'none'; document.body.style.mozUserSelect = 'none'; ele.style.userSelect = 'none'; ele.style.webkitUserSelect = 'none'; ele.style.msUserSelect = 'none'; ele.style.mozUserSelect = 'none'; } // 恢复禁用的文本选择功能 function restoreUserSelect(ele) { if (!ele) return false; document.body.style.userSelect = 'text'; document.body.style.webkitUserSelect = 'text'; document.body.style.msUserSelect = 'text'; document.body.style.mozUserSelect = 'text'; ele.style.userSelect = 'text'; ele.style.webkitUserSelect = 'text'; ele.style.msUserSelect = 'text'; ele.style.mozUserSelect = 'text'; } function drag() { var idModalTitle = document.getElementById('idModalTitle'); var idDragModal = idModalTitle.parentNode; var diffLeft, diffTop, isDraging = false; idModalTitle.onmousedown = function(e) { var e = e || window.event; isDraging = true; diffLeft = e.clientX - idDragModal.offsetLeft; // 鼠标离左边框的距离 diffTop = e.clientY - idDragModal.offsetTop; // 鼠标离顶部边框的距离 cancelUserSelect(idDragModal); }; document.onmousemove = function(e) { var e = e || window.event; if (!isDraging) return false; if (idDragModal.style.marginLeft !== 0) { idDragModal.style.marginLeft = 0; } if (idDragModal.style.marginTop !== 0) { idDragModal.style.marginTop = 0; } // 新的鼠标离浏览器左边距离，减去鼠标离左边框的距离 var left = e.clientX - diffLeft; // 新的鼠标离浏览器顶部距离，减去鼠标离顶部边框的距离 var top = e.clientY - diffTop; if (left < 0) { left = 0; } else if (left > window.innerWidth - idDragModal.offsetWidth) { left = window.innerWidth - idDragModal.offsetWidth; } if (top < 0) { top = 0; } else if (top > window.innerHeight - idDragModal.offsetHeight) { top = window.innerHeight - idDragModal.offsetHeight; } idDragModal.style.left = left + "px"; idDragModal.style.top = top + "px"; }; document.onmouseup = function(e) { if (!isDraging) return false; isDraging = false; restoreUserSelect(idDragModal); }; } drag(); </script> </body> </html>