agruments应用——求出函数参数的总合&&css函数——设置/读取对象的属性&&当前输入框高亮显

浏览数：41 / 时间：2015年06月09日

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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>agruments应用——求出函数参数的总合</title>
<style>
pre{color:green;padding:10px 15px;background:#f0f0f0;border:1px dotted #333;font:12px/1.5 Courier New;}
span{color:#999;}
</style>
</head>
<body>
<pre>
&lt;script type="text/javascript"&gt;
    var i = iResult = 0
    function sum()
    {
        for (var i = 0; i < arguments.length; i++)
        {
            iResult += arguments[i]
        }
        return iResult
    }
    <span>//应用</span>
    alert(sum(1,2,3,4,5,6,7,8,9,10)) <span>//输出55</span>
&lt;/script&gt;
</pre>
<script type="text/javascript">
var i = iResult = 0
function sum()
{
    for (var i = 0; i < arguments.length; i++)
    {
        iResult += arguments[i]
    }
    return iResult
}
//应用
alert(sum(1,2,3,4,5,6,7,8,9,10))
</script>
</body>
</html>

css函数——设置/读取对象的属性

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>css函数——设置/读取对象的属性</title>
<style>
div{width:400px;height:200px;background:#fef4eb;border:1px solid #f60;margin:0 auto;}
input{border:0;color:#fff;cursor:pointer;font-weight:700;background:#f60;padding:2px 4px;margin:10px 0 0 10px;}
</style>
<script type="text/javascript">
function css(obj, attr, value)
{
    switch (arguments.length)
    {
        case 2:
            if(typeof arguments[1] == "object")
            {    //二个参数, 如果第二个参数是对象, 批量设置属性
                for (var i in attr)obj.style[i] = attr[i]
            }
            else
            {    //二个参数, 如果第二个参数是字符串, 读取属性值
                return obj.currentStyle ? obj.currentStyle[attr] : getComputedStyle(obj, null)[attr]
            }
            break;
        case 3:
            //三个参数, 单一设置属性
            obj.style[attr] = value;
            break;
        default:
            alert("参数错误！")
    }
}
window.onload = function ()
{
    var oBox = document.getElementById("box");
    var aInput = oBox.getElementsByTagName("input");
    
    //第一个按钮点击事件
    aInput[0].onclick = function ()
    {
        //两个参数, 第二个参数为字符串, 读取属性值
        alert("width: " + css(oBox, "width") + "\nheight: " + css(oBox, "height") + "\nbackground-color: " + css(oBox, "backgroundColor"))
    };
    //第二个按钮点击事
    aInput[1].onclick = function ()
    {
        //两个参数, 第二个参数为对象, 属性批量设置
        css(oBox, {width: "330px", height: "100px", borderColor: "#0084ff", backgroundColor: "#eff8ff"});
        //三个参数, 属性单一设置
        for (i = 0; i < aInput.length; i++) css(aInput[i], "backgroundColor", "#0084ff")
    }
    //第三个按钮点击事件
    aInput[2].onclick = function ()
    {
        //两个参数, 第二个参数为对象, 属性批量设置
        css(oBox, {width: "400px", height: "200px", borderColor: "#f60", backgroundColor: "#fef4eb"});
        //三个参数, 属性单一设置
        for (i = 0; i < aInput.length; i++) css(aInput[i], "backgroundColor", "#f60")    
    }
};
</script>
</head>
<body>
<div id="box">
    <input type="button" value="Get Style" /><input type="button" value="Set Style" /><input type="button" value="Default Style" />
</div>
</body>
</html>

当前输入框高亮显

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>当前输入框高亮显示</title>
<style>
body,form,h2,p,input{margin:0;padding:0;}
body{color:#4f4f4f;font:14px/1.5 \5fae\8f6f\96c5\9ed1;}
form{width:400px;background:#fef4eb;border:2px solid #f60;padding-bottom:10px;overflow:hidden;zoom:1;margin:10px auto;}
form h2{color:#fe791e;font-size:16px;background:#ffebd7;border-bottom:2px solid #f60;padding:5px 10px;}
form p{float:left;clear:both;width:100%;height:31px;margin-top:10px;line-height:31px;}
form label,form input{float:left;}
form label{width:100px;height:31px;text-align:right;}
form input{border:0;font-family:\5fae\8f6f\96c5\9ed1;background:url(img/input.png) no-repeat;}
form .f-text,form .f-text-high{width:203px;height:31px;padding-left:5px;line-height:31px;}
form .f-text-high{background-position:0 -31px;}
form .f-btn{color:#fff;width:104px;height:31px;cursor:pointer;font-size:16px;background:#f60;line-height:31px;border-radius:5px;}
</style>
<script type="text/javascript">
window.onload = function ()
{
    var aInput = document.getElementsByTagName("input");
    var i = 0;
    for (i = 0; i < aInput.length - 1; i++)
    {
        aInput[i].onfocus = function ()
        {
            this.className = "f-text-high"
        };
        aInput[i].onblur = function ()
        {
            this.className = "f-text"
        }    
    }
};
</script>
</head>
<body>
<form>
    <h2>用户登录</h2>
    <p><label>用户名：</label><input class="f-text" type="text" /></p>
    <p><label>密码：</label><input class="f-text" type="password" /></p>
    <p><label></label><input class="f-btn" type="button" value="登 录" /></p>
</form>
</body>
</html>