console 命令行工具 X clear

console

window.onload = function(){
    var oBtn=document.getElementById("btn");
    oBtn.onclick = function(){
        alert("欢迎您");
    }
    var oDivBtn=document.getElementById("divBtn");
    divBtn.onclick=function(){
        alert("我不是按钮");
    }

    var oPContent = document.getElementById("content");
    oPContent.onmouseover = function(){
        this.style.color="red";
    }
    oPContent.onmouseout = function (){
        this.style.color="black";
    }

    var oUpdownBtn = document.getElementById("updown");
    oUpdownBtn.onmousedown = function(){
        this.style.color="blue";
    }
    oUpdownBtn.onmouseup = function (){
        oUpdownBtn.style.color="black";
    }

    oUpdownBtn.onmousemove = function(){
        this.style.background = "lightskyblue";
    }

    var oString = document.getElementById("string");
    var oLength = document.getElementById("length");
    oString.onkeyup = function(){
        var str=oString.value;
        oLength.innerHTML = str.length;
    }
    //oString.focus();

    var oNumber = document.getElementById("number");
    var oHint = document.getElementById("hint");
    oNumber.onkeyup = function(){
        var regex=/^[0-9]*$/;

        if(regex.test(oNumber.value)){
            oHint.innerHTML="输入正确";
            oHint.style.color="green";
        }
        else{
            oHint.innerHTML="必须输入数字";
            oHint.style.color="red";
        }
    }

    var oSearch = document.getElementById("search");
    oSearch.onfocus = function(){
        if(this.value == "百度一下，你就知道"){
            this.value=""
        }
    }
    oSearch.onblur = function(){
        if(this.value==""){
            this.value="百度一下，你就知道";}
    }

    var oSingleText = document.getElementById("singleText");
    var oMultipleText = document.getElementById("multipleText");

    oSingleText.onselect = function(){
        //alert(this.value);
    }

    oSingleText.onclick = function(){
        this.select();
    }

    oMultipleText.onselect = function(){
        alert(this.value);
    }

    var oFruits = document.getElementsByName("fruit");
    var oPFruits = document.getElementById("fruitchosen");
     for (var i = 0; i < oFruits.length; ++i) {
        oFruits[i].onchange = function () {
            if(this.checked) {
                oPFruits.innerHTML="你的选择是："+this.value;
            }
        }
    } 

    var oSelectAll = document.getElementById("selectAll");
    var oFruits1 = document.getElementsByName("fruit1")

    oSelectAll.onchange = function(){
        if(this.checked){
            for (var i=0;i< oFruits1.length; ++i){
                oFruits1[i].checked = true;
            }
        }
        else{
             for (var i=0;i< oFruits1.length; ++i){
                oFruits1[i].checked = false;
            }
        }
    }


    var oLinkList = document.getElementById("linkList");
    oLinkList.onchange = function(){
        var link= this.options[this.selectedIndex].value;
        window.open(link);
    }
} 
//防止被复制
document.body.oncopy = function(){
    return false;
}
//防止内容被选取
document.body.onselectstart = function(){
    return false;
}

function alertMes(){
    alert("新华学院")
}

<!DOCTYPE html> 
<html>
    <head>
        <meta charset="utf-8" />
        <title></title>
        <style type="text/css">
            
        </style>
        <script>
        </script>
    </head>
    <body>
        <button onclick="alertMes()">弹出信息</button>
        <br/>
        <br/>
        <button id="btn">弹出欢迎信息</button>
        <br/>
        <br/>
        <div id="divBtn">点我</div>
        <br/>
        <br/>
        <div><p id="content">广州新华学院</p>
        <button id="updown">按下松开</button></div>
        <div>
            <label>输入任意字符：</label>
            <input type="text" id="string"></input>
            <br />
            <label>字符串长度为：</label>
            <span id="length">0</span>
        </div> 
        <br/>
    <div>
        <label>输入数字：</label>
        <input type="text" id="number"></input>
        <br/>
        <div id="hint"></div>
    </div>
    <br/>
    <br/>
    <div><input id="search" type="text" value="百度一下，你就知道"</input>
    <button>搜索</button></div> 
    <br/>
    <br/>
    <div>
    <input id="singleText" type="text" value="我是单行文本框"></input>
            <br />
            <textarea id="multipleText" cols="20" row="6">我是多行文本框，可以输入很多行</textarea> 
    </div>
    <div>
            <label><input type="radio" name="fruit" value="苹果"></input>苹果</label>
            <label><input type="radio" name="fruit" value="香蕉"></input>香蕉</label>
            <label><input type="radio" name="fruit" value="西瓜"></input>西瓜</label>
            <br />
            <p id="fruitchosen"></p>
        </div>
        <div>
            <p><label><input id="selectAll" type="checkbox"></input>全选/反选：</label></p>
            <label><input type="checkbox" name="fruit1" value="苹果"></input>香蕉</label>
            <label><input type="checkbox" name="fruit1" value="香蕉"></input>西瓜</label>
            <label><input type="checkbox" name="fruit1" value="西瓜"></input>西瓜</label>
        </div> 
        <br />
        <select id="linkList">
            <option value="http://www.baidu.com">百度</option>
            <option value="http://www.sina.com.cn">新浪</option>
            <option value="http://www.qq.com">腾讯</option>
            <option value="http://www.sohu.com">搜狐</option>
        </select> 
    </body>
</html>

#divBtn {
    display: inline-block;
    width: 80px;
    height: 24px;
    line-height: 24px;
    font-family:微软雅黑;
    font-size:15px;
    text-align: center;
    border-radius: 3px;
    background-color: deepskyblue;
    color: White;
    cursor: pointer;
} 
#search{
    color:#bbbbbb;
}