介绍

项目需要在用户登入之后，马上弹出支付确认框

js代码

        var confirm = function () {
            /*--------confirm框----------*/
            //获取页面的高度和宽度
            var sHeight = document.documentElement.scrollHeight;
            var sWidth = document.documentElement.scrollWidth;
            console.log("sHeight="+sHeight,"sWidth="+sWidth);
            //获取页面的可视区域高度和宽度
            var wHeight = document.documentElement.clientHeight;
            var wWidth = document.documentElement.clientWidth;
            console.log("wHeight="+wHeight,"wWidth="+wWidth);
            var oMask = document.createElement("div");
            oMask.id = "mask";
            oMask.style.height = sHeight + "px";
            oMask.style.width = sWidth + "px";
            document.body.appendChild(oMask);
            var oConfirm = document.createElement("div");
            oConfirm.id = "confirm";
            oConfirm.innerHTML = "<div class=‘confirm‘><form method=‘post‘ action=‘payConfirm‘>" +
                "<div class=‘closeDiv‘><span id=‘close‘>X</span></div><div class=‘confirmUl‘>" +
                "<ul>" +
                "<li><span>支付密码：</span><input type=‘text‘ class=‘password‘ name=‘pw‘ placeholder=‘请输入您的支付密码‘></li>" +
                "<li><span>动态验证码：</span><input type=‘text‘ class=‘confirmYZM‘ placeholder=‘请确认您的验证码‘></li>" +
                "<li class=‘btnLi‘><input type=‘submit‘id=‘payBtn‘ class=‘btn‘ value=‘支付‘><input type=‘reset‘ class=‘btn‘ value=‘重置‘></li>" +
                "</ul>" +
                "</div></form></div>";
            document.body.appendChild(oConfirm);
            //获取登陆框的宽和高
            var dHeight = oConfirm.offsetHeight;
            var dWidth = oConfirm.offsetWidth;
            console.log("dHeight="+dHeight,"dWidth="+dWidth);
            //设置登陆框的left和top
            oConfirm.style.left=sWidth/2 - dWidth/2 + "px";
            oConfirm.style.top=sHeight/2 - dHeight/2 + "px";
            var oClose = document.getElementById("close");
            var payBtn = document.getElementById("payBtn")
            oClose.onclick =oMask.onclick = function() {
                //点击登陆框以外的区域也可以关闭登陆框
                document.body.removeChild(oConfirm);
                document.body.removeChild(oMask);
            }
        }

总结：没事多逛逛 慕课网 看着看着就用到项目里了