yvhkidt1221
yvhkidt1221
2015-01-18 13:32

javaScript中返回true和false的问题,求大神解答!!

  • javascript
 <%--
  Created by IntelliJ IDEA.
  User: TopbeCoder5
  Date: 2015/1/18
  Time: 20:44
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>测试alertMsg</title>
    <link href="css/alertMsg.css" rel="stylesheet" type="text/css"/>
    <script type="text/javascript">
        function alertMsg(msg, mode) { //mode为空,即只有一个确认按钮,mode为1时有确认和取消两个按钮
            msg = msg || '';
            mode = mode || 0;
            var top = document.body.scrollTop || document.documentElement.scrollTop;
            var isIe = (document.all) ? true : false;
            var isIE6 = isIe && !window.XMLHttpRequest;
            var sTop = document.documentElement.scrollTop || document.body.scrollTop;
            var sLeft = document.documentElement.scrollLeft || document.body.scrollLeft;
            var winSize = function () {
                var xScroll, yScroll, windowWidth, windowHeight, pageWidth, pageHeight;
                // innerHeight获取的是可视窗口的高度,IE不支持此属性
                if (window.innerHeight && window.scrollMaxY) {
                    xScroll = document.body.scrollWidth;
                    yScroll = window.innerHeight + window.scrollMaxY;
                } else if (document.body.scrollHeight > document.body.offsetHeight) { // all but Explorer Mac
                    xScroll = document.body.scrollWidth;
                    yScroll = document.body.scrollHeight;
                } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
                    xScroll = document.body.offsetWidth;
                    yScroll = document.body.offsetHeight;
                }

                if (self.innerHeight) {    // all except Explorer
                    windowWidth = self.innerWidth;
                    windowHeight = self.innerHeight;
                } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
                    windowWidth = document.documentElement.clientWidth;
                    windowHeight = document.documentElement.clientHeight;
                } else if (document.body) { // other Explorers
                    windowWidth = document.body.clientWidth;
                    windowHeight = document.body.clientHeight;
                }

                // for small pages with total height less then height of the viewport
                if (yScroll < windowHeight) {
                    pageHeight = windowHeight;
                } else {
                    pageHeight = yScroll;
                }

                // for small pages with total width less then width of the viewport
                if (xScroll < windowWidth) {
                    pageWidth = windowWidth;
                } else {
                    pageWidth = xScroll;
                }

                return {
                    'pageWidth': pageWidth,
                    'pageHeight': pageHeight,
                    'windowWidth': windowWidth,
                    'windowHeight': windowHeight
                }
            }();
            //alert(winSize.pageWidth);
            //遮罩层
            var styleStr = 'top:0;left:0;position:absolute;z-index:10000;background:#666;width:' + winSize.pageWidth + 'px;height:' + (winSize.pageHeight + 30) + 'px;';
            styleStr += (isIe) ? "filter:alpha(opacity=80);" : "opacity:0.8;"; //遮罩层DIV
            var shadowDiv = document.createElement('div'); //添加阴影DIV
            shadowDiv.style.cssText = styleStr; //添加样式
            shadowDiv.id = "shadowDiv";
            //如果是IE6则创建IFRAME遮罩SELECT
            if (isIE6) {
                var maskIframe = document.createElement('iframe');
                maskIframe.style.cssText = 'width:' + winSize.pageWidth + 'px;height:' + (winSize.pageHeight + 30) + 'px;position:absolute;visibility:inherit;z-index:-1;filter:alpha(opacity=0);';
                maskIframe.frameborder = 0;
                maskIframe.src = "about:blank";
                shadowDiv.appendChild(maskIframe);
            }
            document.body.insertBefore(shadowDiv, document.body.firstChild); //遮罩层加入文档
            //弹出框
            var styleStr1 = 'display:block;position:fixed;_position:absolute;left:' + (winSize.windowWidth / 2 - 125) + 'px;top:' + (winSize.windowHeight / 2 - 70) + 'px;_top:' + (winSize.windowHeight / 2 + top - 150) + 'px;'; //弹出框的位置
            var alertBox = document.createElement('div');
            var alertTitle = document.createElement('div');
            alertTitle.id = 'alertTitle';
            alertBox.id = 'alertMsg';
            alertBox.style.cssText = styleStr1;
            //创建弹出框里面的内容P标签
            var alertMsg_info = document.createElement('P');
            alertMsg_info.id = 'alertMsg_info';
            alertMsg_info.innerHTML = msg;
            alertTitle.innerHTML = '提示信息!';
            alertBox.appendChild(alertTitle);
            alertBox.appendChild(alertMsg_info);
            //创建按钮
            var styleStr2 = 'display:block;position:fixed;_position:absolute;left:' + (winSize.windowWidth / 2 - 125) + 'px;top:' + (winSize.windowHeight / 2 + 40) + 'px;_top:' + (winSize.windowHeight / 2 + top - 150) + 'px;'; //弹出框的位置
            var alertBottom = document.createElement('div');
            alertBottom.id = 'alertBottom';
            alertBottom.style.cssText = styleStr2;
            if (mode === 1) {
                var btn1 = document.createElement('a');
                btn1.id = 'alertMsg_btn1';
                btn1.href = 'javas' + 'cript:void(0)';
                btn1.innerHTML = '<cite>确定</cite>';
                btn1.onclick = function () {
                    document.body.removeChild(alertBox);
                    document.body.removeChild(shadowDiv);
                    document.body.removeChild(alertBottom);
                    //document.getElementById("logout").click();
                    return true;
                };
                alertBottom.appendChild(btn1);
                var btn2 = document.createElement('a');
                btn2.id = 'alertMsg_btn2';
                btn2.href = 'javas' + 'cript:void(0)';
                btn2.innerHTML = '<cite>取消</cite>';
                btn2.onclick = function () {
                    document.body.removeChild(alertBox);
                    document.body.removeChild(shadowDiv);
                    document.body.removeChild(alertBottom);
                    return false;
                };
            } else {
                var btn2 = document.createElement('a');
                btn2.id = 'alertMsg_btn2';
                btn2.href = 'javas' + 'cript:void(0)';
                btn2.innerHTML = '<cite>确定</cite>';
                btn2.onclick = function () {
                    document.body.removeChild(alertBox);
                    document.body.removeChild(shadowDiv);
                    document.body.removeChild(alertBottom);
                    return false;
                };
            }
            alertBottom.appendChild(btn2);
            document.body.appendChild(alertBox);
            document.body.appendChild(alertBottom);

        }
        function confirmMsg() {
            if (alertMsg("测试", 1)) {
                alert("点击了确定");
            } else {
                alert("点击了取消");
            }
        }
    </script>
</head>
<body>

<input type="button" value="Test the alert"
       onclick="return confirmMsg('test confirm');">

</body>
</html>

为什么一点botton就直接运行了false啊??

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