代码空间项目 -- 窗口移动

1.js控制
var msgTitle=document.createElement("div");

msgTitle.onmousedown=function(e){
        var ev1=e||window.event;
        //获取元素的外边距
        var left=msgBox.offsetLeft;
        var top=msgBox.offsetTop;
        //获取鼠标的坐标
        var x=ev1.clientX;
        var y=ev1.clientY;
        var x3=x-left;
        var y3=y-top;
        //鼠标移动的时候
        document.onmousemove=function(e){
            var ev2=e||window.event;
            //获取鼠标移动后的坐标
            var x2=ev2.clientX;
            var y2=ev2.clientY;
            //计算元素新的坐标
            var newleft=x2-x3;
            var newtop=y2-y3;
            //限制边界
            if(newleft<=0){newleft=-(msgBox.offsetWidth*0)}
            if(newtop<=0){newtop=0};
            msgBox.style.left=newleft+"px";
            msgBox.style.top=newtop+"px";
            
        };
        document.onmouseup=function(){
            document.onmousemove=null;
            document.onmouseup=null;
        }

}

2.jQuery控制
var loginTitle=$("<div></div>");

//窗体移动事件
loginTitle.mousedown(function(e){
        var ev=e||window.event;
        //获取元素的边距
        var loginX=login.offset().left;
        var loginY=login.offset().top;
        //获取鼠标点击时的坐标
        var monseX=ev.clientX;
        var monseY=ev.clientY;
        //计算元素坐标与鼠标坐标的差值
        var chaX=parseFloat(monseX)-parseFloat(loginX);
        var chaY=parseFloat(monseY)-parseFloat(loginY);
        document.onmousemove=function(e){
            var ev2=e||window.event;
            //获取鼠标移动后的坐标
            var x2=ev2.clientX;
            var y2=ev2.clientY;
            //计算元素新的坐标
            var newleft=x2-chaX;
            var newtop=y2-chaY;
            //限制边界
            if(newleft<=0){newleft=0}
            if(newtop<=0){newtop=0};
            login.css({"top":newtop+"px","left":newleft+"px"});
            
        };
        document.onmouseup=function(){
            document.onmousemove=null;
            document.onmouseup=null;
        }
});