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javascript实现拖动层效果代码(符合标准且兼容IE,chrome,firefox)_javascript技巧

来源：咤帕游戏

实例代码一见：
代码如下:

var a;
document.onmouseup = function() {
if (!a) return;
a = "";
};
document.onmousemove = function(d) {
if (!a) return;
d=d||event;
a.style.left = (d.clientX - b) + "px";
a.style.top = (d.clientY - c) + "px";
};
function $(o, e) {
a = o;
b = e.clientX - parseInt(a.style.left);
c = e.clientY - parseInt(a.style.top);
}

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效果：

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

实例代码二见：

代码如下:

无标题文档

var obj=document.getElementById("test");
var b;
obj.onmousedown=function(e){
b=true;
var divLeft=parseFloat(window.getComputedStyle?window.getComputedStyle(obj,null).left:obj.currentStyle.left);
var divTop=parseFloat(window.getComputedStyle?window.getComputedStyle(obj,null).top:obj.currentStyle.top);
var e=e||event;
var divX=e.clientX-divLeft; //计算鼠标和div边框的距离
var divY=e.clientY-divTop;
document.onmousemove=function(e){
if(b){
var e=e||event; //兼容IE8及以下
obj.style.left=e.clientX-divX+"px";
obj.style.top=e.clientY-divY+"px";
}
}
}
document.onmouseup=function(){
b=false;
}

效果：

<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>无标题文档</title> <style type="text/css"> #test{width:200px; height:200px; background:pink; cursor:move; position:absolute; left:100px; top:100px} </style> </head> <body> var obj=document.getElementById("test"); var b; obj.onmousedown=function(e){ b=true; var divLeft=parseFloat(window.getComputedStyle?window.getComputedStyle(obj,null).left:obj.currentStyle.left); var divTop=parseFloat(window.getComputedStyle?window.getComputedStyle(obj,null).top:obj.currentStyle.top); var e=e||event; var divX=e.clientX-divLeft; //计算鼠标和div边框的距离 var divY=e.clientY-divTop; document.onmousemove=function(e){ if(b){ var e=e||event; //兼容IE8及以下 obj.style.left=e.clientX-divX+"px"; obj.style.top=e.clientY-divY+"px"; } } } document.onmouseup=function(){ b=false; } </ script> </body> </html>
[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

实例代码三见（拖动把柄）：

<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>无标题文档</title> <style type="text/css"> *{margin:0;padding:0} #testBox{ width:300px; height:300px; background:red; position:absolute; left:0; top:0} #test{width:200px; height:200px; background:pink; cursor:move; margin:30px} </style> </head> <body> 在这里才能移动 var obj=document.getElementById("test"); var objBox=document.getElementById("testBox"); var b; obj.onmousedown=function(e){ b=true; var divLeft=parseFloat(window.getComputedStyle?window.getComputedStyle(objBox,null).left:objBox.currentStyle.left); var divTop=parseFloat(window.getComputedStyle?window.getComputedStyle(objBox,null).top:objBox.currentStyle.top); var e=e||event; var divX=e.clientX-divLeft; //计算鼠标和div边框的距离 var divY=e.clientY-divTop; document.onmousemove=function(e){ if(b){ var e=e||event; //IE8及以下浏览器得写这句 objBox.style.left=e.clientX-divX+"px"; objBox.style.top=e.clientY-divY+"px"; } } } document.onmouseup=function(){ b=false; } </ script> </body> </html>
[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]