我正在尝试恢复我拥有的一些旧代码，这是一个拼图游戏。它从文件夹中加载图像(拼图(，将它们随机放置在页面周围，然后拖放到板上。这曾经有效，但是当我今天尝试使用它时，它只会抛出错误(见下文(。
.HTML：
<body onload="init();" onmousemove="initDrag();" onmouseup="mousePress=false;">
<div id="main">
<div id="inside">
<img src="holder.gif" style="position:absolute; left:500; top:500;" />
</div>
</div>
<div style="position:absolute;top:10px;left:600px;display:none;">
</div>
<p id="pText" class="congrats" style="position:absolute; top:410px; left:475px;"></p>
<p style="position:absolute; top:20px; left:750px;" class="links"><a href="hard.html">hard puzzle</a> | <a href="main.html">home</a></p>
</body>
Javascript：
// ARRAY FOR PLACEMENT OF IMAGES: [down, over]
var place = new Array([51,300],[51,432],[51,569],[51,707],[112,300],[112,432],[112,569],[112,707],[199,300],[199,432],[199,569],[199,707],[286,300],[286,432],[286,569],[286,707]);
var displayed = new Array();
var mousePress = false;
var pieces = place.length;
var placed = new Array();
var moveObject;
function init() {
var append = "";
for ( i=0; i<pieces; i++ )
{
append+= '<div onDrag="return false;" unselectable=on id="puzzle" name="puzzle" class="puzzleMain"><img src="img/us/img' + i + '.gif" onmousedown="mousePress=true;moveObject=' + i + ';if(document.all) {offsetX=window.event.offsetX;offsetY=window.event.offsetY;}" onmouseup="mousePress=false;doplace(' + i + ');"></div>';
displayed[i] = 0;
placed[i]=0;
}
document.getElementById("main").innerHTML += append;
document.images[i].onload = rndmImg;
}
function rndmImg() {
x=855;y=50;
do {
do {
displayNext = Math.floor( Math.random()* pieces );
} while( displayed[displayNext] );
document.getElementsByName("puzzle")[displayNext].style.top = y;
document.getElementsByName("puzzle")[displayNext].style.left = x;
document.getElementsByName("puzzle")[displayNext].style.visibility="visible";
displayed[displayNext]=1;
x += document.images[displayNext].width;
if( x >= 900 ) {
y += document.images[displayNext].height;
if ( y>=300 ) { x=0 } else { x=851 }
}
} while(!allDisplayed());
}
function allDisplayed() {
for( z=0; z<displayed.length; z++ ) if( !displayed[z] ) return false;
return true;
}
function lower() {
for( p=0;p<document.getElementsByName("puzzle").length;p++ )
document.getElementsByName("puzzle")[p].style.zIndex = 1;
document.getElementsByName("puzzle")[moveObject].style.zIndex=5;
}
function initDrag(e) {
if(!mousePress)return;
if( document.getElementById("inside").innerHTML != "" ) document.getElementById("inside").innerHTML = "";
lower();
if(document.all) {
mouseX = window.event.clientX - (offsetX);
mouseY = window.event.clientY - (offsetY);
} else {
mouseX = e.clientX - 50;
mouseY = e.clientY - 50;
}
document.getElementsByName("puzzle")[moveObject].style.top=mouseY;
document.getElementsByName("puzzle")[moveObject].style.left=mouseX;
return false;
}
function doplace(index) {
w = document.images[index].width;
h = document.images[index].height;
t = parseInt(document.getElementsByName("puzzle")[index].style.top);
l = parseInt(document.getElementsByName("puzzle")[index].style.left);
if ( ( l >= place[index][1]-(w/2) && l <= place[index][1]+(w/2) ) && ( t >= place[index][0]-(h/2) && t <= place[index][0] + (h/2) ) )
{
document.getElementsByName("puzzle")[index].style.top = place[index][0];
document.getElementsByName("puzzle")[index].style.left = place[index][1];
placed[index] = 1;
if(isComplete())
pText.innerHTML = "Puzzle is complete!";
}
}
function generateArray()
{
append="var place = new Array(";
for( i=0; i<document.getElementsByName("puzzle").length; i++ )
{
t = document.getElementsByName("puzzle")[i].style.pixelTop;
l = document.getElementsByName("puzzle")[i].style.pixelLeft;
append+="[" + t + "," + l + "],";
}
document.forms[0].mArray.value = append;
}
function isComplete()
{
for( q=0;q<placed.length;q++ ) if( !placed[q] )return false;
return true;
}
我主要得到的错误是：未捕获的类型错误：无法读取未定义的属性"clientX" at initDrag (easy.html：70( at HTMLBodyElement.onmousemove (easy.html：116(
我这里有一个JSFiddle。谁能阐明问题可能是什么？
在你的代码中，你有onmousemove="initDrag();"所以如果document.all是假的，那么mouseX = e.clientX - 50会抛出一个Cannot read property 'clientX' of undefined，因为你调用initDrag()没有任何关于鼠标移动的参数。
现在你既不应该使用document.all，也不应该使用window.event，两者都是遗物。