如何解决为什么此javascript代码在stackoverflow上起作用，但是在我的html文件中却不起作用？
var m_pos;
function resize(event) {
var parent = resize_el.parentNode;
var dx = m_pos - event.x;
m_pos = event.x;
parent.style.width = (parseInt(getComputedStyle(parent,'').width) + dx) + "px";
}
var resize_el = document.getElementById("resize");
if (resize_el) {
resize_el.addEventListener("mousedown",function(event) {
m_pos = event.x;
document.addEventListener("mousemove",resize,false);
},false);
}
document.addEventListener("mouseup",function() {
document.removeEventListener("mousemove",false);
},false);#update_panel {
position: fixed;
min-width: 420px;
padding-left: 4px;
height: 100%;
top: 0%;
right: 0;
background-color: #f0f0f0;
}
#resize {
background-color: #ccc;
position: absolute;
left: 0;
width: 4px;
height: 100%;
cursor: w-resize;
}<!DOCTYPE html>
<html>
<head>
</head>
<body>
<div id="update_panel">
<div id="resize"></div>
</div>
</body>
</html>我的文件如下：
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
var m_pos;
function resize(event) {
var parent = resize_el.parentNode;
var dx = m_pos - event.x;
m_pos = event.x;
parent.style.width = (parseInt(getComputedStyle(parent,'').width) + dx) + "px";
}
var resize_el = document.getElementById("resize");
if (resize_el) {
resize_el.addEventListener("mousedown",function(event) {
m_pos = event.x;
document.addEventListener("mousemove",false);
},false);
}
document.addEventListener("mouseup",function() {
document.removeEventListener("mousemove",false);
</script>
<style>
#update_panel {
position: fixed;
min-width: 420px;
padding-left: 4px;
height: 100%;
top: 0%;
right: 0;
background-color: #f0f0f0;
}
#resize {
background-color: #ccc;
position: absolute;
left: 0;
width: 4px;
height: 100%;
cursor: w-resize;
}
</style>
</head>
<body>
<div id="update_panel">
<div id="resize"></div>
</div>
</body>
</html>
我在Chrome上使用XAMPP本地主机。请帮帮我！
解决方法
将<script>....</script>块代码移动到<body>的末尾。像这样：
<body>
<div>
...
</div>
<script>
...
</script>
</body>
它应该工作
有关为何有效的说明，请参见此处： Where should I put <script> tags in HTML markup?
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