var mystr="Hello World!";
document.write(mystr.substr(mystr.indexOf("W"))+ "<br />");
document.write(mystr.substr(mystr.indexOf("H"),mystr.indexOf("o")+1));
document.write(mystr.substr(mystr.indexOf("W"))+ "<br />");
document.write(mystr.substr(mystr.indexOf("H"),mystr.indexOf("o")+1));
2015-03-29
已采纳回答 / 渊翼
`geteMinutes`拼写错啦,应该是`getMinutes`,而且呢,建议你把js放把`</body>`前面,也就是说应该是当`input`解析完成后,再运行js
2015-03-29
卸载事件(onunload)
<script type="text/javascript">
window.onunload = onunload_message;
function onunload_message(){
alert("您确定离开该网页吗?");
}
</script>
</head>
<script type="text/javascript">
window.onunload = onunload_message;
function onunload_message(){
alert("您确定离开该网页吗?");
}
</script>
</head>
2015-03-29
var otest = document.getElementById("test");
var newnode= document.createElement("li");
newnode.innerHTML="PHP";
otest.appendChild(newnode);
var newnode= document.createElement("li");
newnode.innerHTML="PHP";
otest.appendChild(newnode);
2015-03-29