本文實例為大家分享了js實現窗口拖拽的具體代碼,供大家參考,具體內容如下
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <style type="text/css"> #box { height: 300px; width: 300px; background-color: green; position: absolute; } </style> </head> <body> <div id="box"> </div> </body> <script type="text/javascript"> var box = document.getElementById("box"); //鼠標按下的函數 box.onmousedown = function(ev) { var oEvent = ev || event; //求出鼠標和box的位置差值 var x = oEvent.clientX - box.offsetLeft; var y = oEvent.clientY - box.offsetTop; //鼠標移動的函數 //把事件加在document上,解決因為鼠標移動太快時, //鼠標超過box後就沒有了拖拽的效果的問題 document.onmousemove = function(ev) { var oEvent = ev || event; //保證拖拽框一直保持在浏覽器窗口內部,不能被拖出的浏覽器窗口的范圍 var l = oEvent.clientX - x; var t = oEvent.clientY - y; if(l < 0) { l = 0; } else if(l > document.documentElement.clientWidth - box.offsetWidth) { l = document.documentElement.clientWidth - box.offsetWidth; } if(t < 0) { t = 0; } else if(t > document.documentElement.clientHeight - box.offsetHeight) { t = document.documentElement.clientHeight - box.offsetHeight; } box.style.left = l + "px"; box.style.top = t + "px"; } //鼠標抬起的函數 document.onmouseup = function() { document.onmousemove = null; document.onmouseup = null; } //火狐浏覽器在拖拽空div時會出現bug //return false阻止默認事件,解決火狐的bug return false; } </script> </html>
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持。