问在JavaScript函数中定义全局变量？

提问于 2017-12-20 11:40:42

回答 2关注 0查看 1.1K

是否可以在JavaScript函数中定义一个全局变量？

我想在其他函数中使用trailimage变量（在makeObj函数中声明）。

<html xmlns="http://www.w3.org/1999/xhtml">

    <head id="Head1" runat="server">

        <title></title>

        <script type="text/javascript">

            var offsetfrommouse = [10, -20];

            var displayduration = 0;

            var obj_selected = 0;

            function makeObj(address) {

                **var trailimage = [address, 50, 50];**

                document.write('<img id="trailimageid" src="' + trailimage[0] + '" border="0"  style=" position: absolute; visibility:visible; left: 0px; top: 0px; width: ' + trailimage[1] + 'px; height: ' + trailimage[2] + 'px">');

                obj_selected = 1;

            function truebody() {

                return (!window.opera && document.compatMode && document.compatMode != "BackCompat") ? document.documentElement : document.body;

            function hidetrail() {

                var x = document.getElementById("trailimageid").style;

                x.visibility = "hidden";

                document.onmousemove = "";

            function followmouse(e) {

                var xcoord = offsetfrommouse[0];

                var ycoord = offsetfrommouse[1];

                var x = document.getElementById("trailimageid").style;

                if (typeof e != "undefined") {

                    xcoord += e.pageX;

                    ycoord += e.pageY;

                else if (typeof window.event != "undefined") {

                    xcoord += truebody().scrollLeft + event.clientX;

                    ycoord += truebody().scrollTop + event.clientY;

                var docwidth = 1395;

                var docheight = 676;

                if (xcoord + trailimage[1] + 3 > docwidth || ycoord + trailimage[2] > docheight) {

                    x.display = "none";

                    alert("inja");

                else

                    x.display = "";

                x.left = xcoord + "px";

                x.top = ycoord + "px";

            if (obj_selected = 1) {

                alert("obj_selected = true");

                document.onmousemove = followmouse;

                if (displayduration > 0)

                    setTimeout("hidetrail()", displayduration * 1000);

        </script>

    </head>

    <body>

        <form id="form1" runat="server">

        <img alt="" id="house" src="Pictures/sides/right.gif" style="z-index: 1; left: 372px;

            top: 219px; position: absolute; height: 138px; width: 120px" onclick="javascript:makeObj('Pictures/sides/sides-not-clicked.gif');" />

        </form>

    </body>

</html>

javascript

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