常用JavaScript函数 31 - 46（自我总结）-优快云博客

常用JavaScript函数 1 - 15 （自我总结）

常用JavaScript函数 16 - 30（自我总结）

31、获得当前日期

32、 jquery 操作 radio

33、双击滚屏

34、框架显示/隐藏

35、 JavaScript中的var_dump

36、为 JavaScript 添加 in_array 支持二维数组

37、支持div的抖动

38、 JavaScript中的empty();

39、 input or area 显示/隐藏提示信息

40、 str_replace

41、 implode / explode

42、全选

43、去除数组中的重复项

44、用JavaScript动态加载CSS和JS文件

45、用JavaScript生成菜单树(build_file_tree) 需要得到JSON

46、 textarea自动适应高度

31、获得当前日期

<script language='javascript'> 
	function startTime(){ 
		var today=new Date(); 
		var y = today.getFullYear();
		var m = today.getMonth();
		var t = today.getDate();
		var d = today.getDay();
		var h = today.getHours(); 
		var i = today.getMinutes(); 
		var s = today.getSeconds(); 

		var weekday = {
				'0': '星期日',
				'1': '星期一',
				'2': '星期二',
				'3': '星期三',
				'4': '星期四',
				'5': '星期五',
				'6': '星期六'
			};

		//add a zero in front of number<10 
		i = checkTime(i); 
		s = checkTime(s); 

		document.getElementById('txt').innerHTML = '今天是: ' + y + '年 ' + m + '月' + t + '日' + weekday[d] + '; 现在的时间是' + h + ':' + i + ':' + s; 
		t=setTimeout('startTime()',1000); 
	} 
	
	function checkTime(i){ 
		if (i<10){ 
			i='0'+i; 
		} 
		return i; 
	} 
</script> 

<body οnlοad='startTime()'>
	<div id='txt'></div>
	<br><br>
</body>

详细参考： http://www.w3school.com.cn/js/jsref_obj_date.asp

32、jquery 操作 radio

检测单个radio是否选中

	<script src="http://code.jquery.com/jquery-latest.js"></script>  
	<script type="text/javascript">
	$(function(){
		if($('input[name=Number]').attr('checked')){
			// do something
		}else{
			// do something
		}
	})
	</script> 

    <input name="Number" type="radio" value="50">50

检测多个radio是否选中

	<script src="http://code.jquery.com/jquery-latest.js"></script>  
	<script type="text/javascript">
	$(function(){
		if($('input[name=Number_of_Employees]:checked').length  != 1){
			// do something
		}else{
			// do something
		}
	})
	</script>  
    
    <input name="Number" type="radio" value="50">50
    <input name="Number" type="radio" value="250">250
    <input name="Number" type="radio" value="40">450

获取radio的值

	<script src="http://code.jquery.com/jquery-latest.js"></script>  
	<script type="text/javascript">
	$(function(){
		alert($('input[name=Number]:checked').val());
	})
	</script>  
    
    <input name="Number" type="radio" value="50">50
    <input name="Number" type="radio" checked="checked" value="250">250
    <input name="Number" type="radio" value="40">450

点击层选中复选框

<script>
$(function(){
       $('#ecard li').click(function(){
              $(this).find(':checkbox').attr('checked',true);
       });
})
</script>

JavaScript版

<title>JavaScript 获取复选框的值</title>
<script>
function checkbox()
{
var str=document.getElementsByName("box");
var objarray=str.length;
var chestr="";
for (i=0;i<objarray;i++)
{
  if(str[i].checked == true)
  {
   chestr+=str[i].value+",";
  }
}
if(chestr == "")
{
  alert("请先选择复选框～！");
}
else
{
  alert("复选框的值是："+chestr);
}
}
</script>
选择您的拿手技术：
  <input type="checkbox" name="box" id="box1" value="ASP" />ASP
  <input type="checkbox" name="box" id="box2" value="PHP" />PHP
  <input type="checkbox" name="box" id="box3" value="JSP" />JSP
  <input type="button" name="button" id="button" οnclick="checkbox()" value="提交" />

33、双击滚屏

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>双击滚屏</title>
<style>
	body { color: #FFFFFF; font-family: Verdana; font-size: 9pt }
</style>

<script language=JavaScript>
	var currentpos,timer;

	function initialize(){
		timer=setInterval("scrollwindow()",10);
	}

	function sc(){
		clearInterval(timer);
	}

	function scrollwindow(){
		currentpos=document.body.scrollTop;
		window.scroll(0,++currentpos);
		if (currentpos != document.body.scrollTop)
		sc();
	}

	document.οnmοusedοwn=sc
	document.οndblclick=initialize
</script>

</head>

<body bgcolor="#0496DC">
	<p align="center">请双击</p>
	<p>1</p><p>2</p><p>3</p><p>4</p><p>5</p><p>6</p><p>7</p><p>8</p><p>9</p><p>10</p>
	<p>1</p><p>2</p><p>3</p><p>4</p><p>5</p><p>6</p><p>7</p><p>8</p><p>9</p><p>10</p>
	<p>1</p><p>2</p><p>3</p><p>4</p><p>5</p><p>6</p><p>7</p><p>8</p><p>9</p><p>10</p>
	<p>1</p><p>2</p><p>3</p><p>4</p><p>5</p><p>6</p><p>7</p><p>8</p><p>9</p><p>10</p>
	<p>1</p><p>2</p><p>3</p><p>4</p><p>5</p><p>6</p><p>7</p><p>8</p><p>9</p><p>10</p>
</body>
</html>

34、框架显示/隐藏

<HTML>
<HEAD>
<TITLE>框架显示/隐藏</TITLE>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</style>
<SCRIPT>
function switchSysBar(){
	if (switchPoint.innerText==3){
		switchPoint.innerText=4
		document.all("frmTitle").style.display="none"
	}
	else{
		switchPoint.innerText=3
		document.all("frmTitle").style.display=""
	}
}
</SCRIPT>
</HEAD>
<BODY bgColor="skyblue" scroll="no" style="MARGIN: 0px">
<TABLE border=0 cellPadding=0 cellSpacing=0 height="100%" width="100%">
  <TBODY>
    <TR> 
      <TD bgColor=#eeeeee align=middle id=frmTitle noWrap vAlign=center name="fmTitle">
		<IFRAME frameBorder=0 id=left name=left src="about:blank" style="HEIGHT: 100%; VISIBILITY: inherit; WIDTH: 145px; Z-INDEX: 2"></IFRAME> 
      <TD style="WIDTH: 10pt"> <TABLE border=0 cellPadding=0 cellSpacing=0 height="100%">
          <TBODY>
            <TR> 
              <TD οnclick=switchSysBar() style="HEIGHT: 100%"><SPAN class=navPoint 
            id=switchPoint title=关闭/打开左栏>fasdf3</SPAN></TD>
            </TR>
          </TBODY>
        </TABLE></TD>
      <TD style="WIDTH: 100%"><IFRAME frameBorder=0 id=frmright name=frmright 
      scrolling=no src="/index.html" 
      style="HEIGHT: 100%; VISIBILITY: inherit; WIDTH: 100%; Z-INDEX: 1"> </IFRAME></TD>
    </TR>
  </TBODY>
</TABLE>
</BODY>
</HTML>

35、JavaScript中的var_dump

<script>

 function var_dump(obj) {
  if(typeof obj == "object") {
     return "Type: "+typeof(obj)+((obj.constructor) ? "\nConstructor: "+obj.constructor : "")+"\nValue: " + obj;
  } else {
     return "Type: "+typeof(obj)+"\nValue: "+obj;
  }
}//end function var_dump
 
var name = 'demo';
alert(var_dump(name));

</script>

36、为 JavaScript 添加 in_array 支持二维数组

<script type="text/javascript">

function in_array (needle, haystack, argStrict) {
    // Checks if the given value exists in the array  
    // 
    // *     example 1: in_array('van', ['Kevin', 'van', 'Zonneveld']);    // *     returns 1: true
    // *     example 2: in_array('vlado', {0: 'Kevin', vlado: 'van', 1: 'Zonneveld'});
    // *     returns 2: false
    // *     example 3: in_array(1, ['1', '2', '3']);
    // *     returns 3: true    // *     example 3: in_array(1, ['1', '2', '3'], false);
    // *     returns 3: true
    // *     example 4: in_array(1, ['1', '2', '3'], true);
    // *     returns 4: false
    var key = '', strict = !!argStrict; 
    if (strict) {
        for (key in haystack) {
            if (haystack[key] === needle) {
                return true;            
			}
        }
    } else {
        for (key in haystack) {
            if (haystack[key] == needle) {                
				return true;
            }
        }
    }
     return false;
}

if(in_array('Kevin', {0: 'Kevin', vlado: 'van', 1: 'Zonneveld'})){
	alert(1);
}else{
	alert(0);
}
</script>

37、支持div的抖动

<style type="text/css">
#body{
	text-align:center;
}

#test{
	width:200px;
	position:absolute;
	margin:10px auto;
	height:100px;
	border:2px dotted red;
	text-align:center;
}
</style>

<body>
	<div style="margin:10px 200px">
		<div> <input type="button" value="开始抖动吧" οnclick="nn.start()" /></div>
		<div> <input type="button" value="停止抖动" οnclick="nn.stop()" /></div>
		<div id="test">
			<br>
			<a href="http://www.csscss.org">this is a test</a><br>
			<a href="http://www.csscss.org">this is a test</a><br>
			<a href="http://www.csscss.org">this is a test</a><br>
		</div>
	</div>
</body>

<script type="text/javascript">
	var m = document.getElementById("test");
	function SKclass (obj,Rate,speed) {
		var oL = obj.offsetLeft;
		var oT = obj.offsetTop;
		this.stop = null;
		this.oTime = null;
		var range = 0;
		var om = this;

		this.start=function(){
			if(parseInt(obj.style.left)==oL-2){
				obj.style.top=oT+2+"px";
				setTimeout(function(){obj.style.left=oL+2+"px"},Rate)
			}
			else
			{
				obj.style.top=oT-2+"px";
				setTimeout(function(){obj.style.left=oL-2+"px"},Rate)
			}
			
			range++;

			if(range < 7){
				this.oTime=setTimeout(function(){om.start()},speed);
			}else{
				clearTimeout(this.oTime);
				range = 0;
			}
		}

		this.stop=function(){
			clearTimeout(this.oTime);
		}
	}
	var nn=new SKclass(m,20,70);
</script>

38、JavaScript中的empty();

function empty (mixed_var) {
    var key;    
    if (mixed_var === '' ||
        mixed_var === ' ' ||        
        mixed_var === 0 ||
        mixed_var === '0' ||
        mixed_var === null ||        
		mixed_var === false ||
        typeof mixed_var === 'undefined'
    ){
        return true;
    } 
    if (typeof mixed_var == 'object') {
        for (key in mixed_var) {
            return false;
        }        return true;
    }
 
    return false;
}

39、input or area 显示/隐藏提示信息

// <input type="text" value="密碼" οnclick="clearText(this,'密碼')" />




function clearText (el,message){
	var obj = el;
	if(typeof(el) == "string")
		obj = document.getElementById(id);
	if(obj.value == message){
		obj.value = "";
	}
	obj.onblur = function(){
		if(obj.value == ""){
			obj.value = message;
		}
	}
}

function clearArea (el,message){
	var obj = el;
	obj.style.borderColor = "#3399cc";
	if(obj.innerHTML == message){
		obj.innerHTML= "";
	}
	obj.onblur = function(){
		obj.style.borderColor = "#999999";
		if(obj.innerHTML == ""){
			obj.innerHTML = message;
		}
	}
}