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javascript常見用法總結(jié)

更新時間：2014年05月22日 09:30:17 作者：

javascript常見用法，比如，編碼解碼、間隔及掩飾執(zhí)行、檢查輸入是否為數(shù)字、獲取、創(chuàng)建和刪除節(jié)點(diǎn)等等

js解碼和編碼.html

 
<!DOCTYPE html> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>javascript的編碼和解碼</title> 
<script type="text/javascript"> 

function gel(id) { 
return document.getElementById(id); 
} 

window.onload = function() { 
//alert(document.getElementById("span1").innerHTML 
gel("btn1").onclick = function() { 
alert(encodeURI(gel("span1").innerHTML)); 
}; 

gel("btn2").onclick = function() { 
alert(decodeURI(gel("span1").innerHTML)); 
}; 
}; 
</script> 
</head> 
<body> 
<span id="span1">瘋漢三雄起了!</span> 
<input type="button" id="btn1" value="編碼后" /> 
<input type="button" id="btn2" value="解碼后" /> 
</body> 
</html> 

js中setInterval和setTimeout的使用.html

復(fù)制代碼代碼如下:

 
<!DOCTYPE html> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> 
<title>js中setInterval和setTimeout的使用</title> 
<script type="text/javascript"> 
var time = 10; 
var id = 0; 
function gel(id) { 
return document.getElementById(id); 
} 

function dectime() { 
if (time > 0) { 
time--; 
gel("timespan").innerHTML = time; 
} else { 
//清除時針 
clearInterval(id); 
} 
} 

window.onload = function() { 
id = setInterval(dectime, 1000); 
}; 
</script> 
</head> 
<body> 
<span >倒計(jì)時<span id="timespan" style="color: red;"></span>秒</span> 
</body> 
</html> 

js檢查輸入是否為數(shù)字.html

復(fù)制代碼代碼如下:

 
<!DOCTYPE html> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> 
<title>js檢查輸入是否為數(shù)字</title> 
<script type="text/javascript"> 



window.onload= function() { 
document.getElementById("btn1").onclick = function() { 
var i = prompt("輸入要判斷的值"); 
//window.alert(i); 
if (!isNaN(i)) { 
window.alert("是數(shù)字"); 
} else { 
window.alert("不是數(shù)字"); 
} 
}; 
} 
</script> 
</head> 
<body> 
<input type="button" id="btn1" value="判斷數(shù)字" /> 
</body> 
</html> 

js動態(tài)獲取、創(chuàng)建和刪除節(jié)點(diǎn).html

復(fù)制代碼代碼如下:

 
<!DOCTYPE html> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>js動態(tài)獲取、創(chuàng)建和刪除節(jié)點(diǎn)</title> 
<script type="text/javascript"> 
function gel(id) { return document.getElementById(id); } 

window.onload = function () { 
gel("btnProAdd").onclick = function () { 
//在proList下面增加子節(jié)點(diǎn) 
var linew = document.createElement("li"); 
linew.innerHTML = prompt("輸入要新增的省份"); 
gel("proList").appendChild(linew); 
//重新綁定所有的點(diǎn)擊刪除事件 
DelLiOnClick(); 
}; 

//雙擊li子節(jié)點(diǎn)，刪除它 

function DelLiOnClick() { 
//1.首先得到所有的子節(jié)點(diǎn) 
var liNodes = gel("proList").childNodes; 

for (var i = 0; i < liNodes.length; i++) { 
liNodes[i].onclick = function () { 
//alert(liNodes[i]).innerHTML;//因?yàn)閛nclick綁定的是匿名函數(shù)，所以i到這里永遠(yuǎn)只會是7 
//下面是正確的刪除方法, 使用this.因?yàn)橛|發(fā)onclick事件的永遠(yuǎn)是你選中的li 
this.parentNode.removeChild(this); 
}; 
} 
} 


}; 
</script> 
</head> 
<body> 
<ul id="proList"> 
<li>山西</li> 
<li>河南</li> 
<li>北京</li> 
</ul> 

<input type="button" value="新增省份" id="btnProAdd" /> 
</body> 
</html> 

js中setInterval和setTimeout的使用.html

復(fù)制代碼代碼如下:

 
<!DOCTYPE html> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> 
<title>js中setInterval和setTimeout的使用</title> 
<script type="text/javascript"> 
var time = 10; 
var id = 0; 
function gel(id) { 
return document.getElementById(id); 
} 

function dectime() { 
if (time > 0) { 
time--; 
gel("timespan").innerHTML = time; 
} else { 
//清除時針 
clearInterval(id); 
} 
} 

window.onload = function() { 
id = setInterval(dectime, 1000); 
}; 
</script> 
</head> 
<body> 
<span >倒計(jì)時<span id="timespan" style="color: red;"></span>秒</span> 
</body> 
</html> 

js動態(tài)添加表格數(shù)據(jù).html

復(fù)制代碼代碼如下:

 
<!DOCTYPE html> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>動態(tài)添加表格數(shù)據(jù)</title> 

<script type="text/javascript"> 

var mailArr = [ 
{ "title": "一個c#問題", "name": "張三", "date": "2014-03-21" }, 
{ "title": "一個javascript問題", "name": "李四", "date": "2014-03-21" }, 
{ "title": "一個c問題", "name": "五五", "date": "2014-03-21" }, 
{ "title": "一個c++問題", "name": "趙六", "date": "2014-03-21" } 
]; 

window.onload = function () { 
var tab = document.getElementById("tb"); 
//把mailArr循環(huán)遍歷方式以tr的方式加入表格中 
for (var rowindex = 0; rowindex < mailArr.length; rowindex++) { 
var tr = document.createElement("tr"); 
var th1 = document.createElement("th"); 
var th2 = document.createElement("th"); 
var th3 = document.createElement("th"); 
var th4 = document.createElement("th"); 
th1.innerHTML = "<input type='checkbox'/>"; 
th2.innerHTML = mailArr[rowindex].title; 
th3.innerHTML = mailArr[rowindex].name; 
th4.innerHTML = mailArr[rowindex].date; 

tr.appendChild(th1); 
tr.appendChild(th2); 
tr.appendChild(th3); 
tr.appendChild(th4); 

tab.appendChild(tr); 
} 

}; 
</script> 

</head> 
<body> 
<table id="tb" border="1px;" style="border-collapse: collapse;"> 
<tr> 
<th>序列</th> 
<th>標(biāo)題</th> 
<th>發(fā)郵人</th> 
<th>發(fā)件時間</th> 
</tr> 
<!-- 循環(huán)增加 --> 
</table> 
</body> 
</html> 