HTML DOM应用案例1

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="tzy1.css" type="text/css">
    <script type="text/javascript" src="tzy1.js" language="JavaScript"></script>
</head>
<body>
<div id="div"><b id="b">我是一只小小鸟</b></div>
<form>
    <input type="button" value="随机改变字体颜色按钮" onclick="gbzt()">
    <input type="button" value="随机改变背景颜色按钮" onclick="gbbj()"></br>
    <input type="text" id="text">
    内容<input type="button" value="改变内容" onclick="gbtext()"></br>
    宽度<input type="text" id="gbwid">px
    <input type="button" value="改变背景宽度" onclick="gbwidth()"></br>
    高度<input type="text" id="gbhei">px
    <input type="button" value="改变背景高度" onclick="gbheight()"></br>
    <input type="reset" value="清空输入框"></br>
    <input type="button" value="字体隐藏" onclick="ycb()">
    <input type="button" value="全部隐藏" onclick="ycdiv()"></br>
    <input type="button" value="字体显示" onclick="xsb()">
    <input type="button" value="全部显示" onclick="xsdiv()"></br>
    <input type="button" value="是否重置" onclick="firm()">
</form>
</body>
</html>

div{
    color: forestgreen;
    background-color: coral;
    width: 100px;
    height: 100px;

}

var chars = ['0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'];
var color;
function randomColor() {
    color="";
    for(var i=0;i<6;i++){
    var count = Math.floor(Math.random()*16);
    color += chars[count];
}
}
function gbzt() {
    randomColor();
    document.getElementById("div").style.color="#"+color;
}
function gbbj() {
    randomColor();
    document.getElementById("div").style.backgroundColor="#"+color;
}
function gbwidth() {
   var val = document.getElementById("gbwid").value;
   if(isNaN(val)||val==""){
       alert("必须输入数字,不能为空")
   }else{
    document.getElementById("div").style.width=val+'px';
   }
}
function gbheight() {
    var val = document.getElementById("gbhei").value;
    if(isNaN(val)||val==""){
        alert("必须输入数字,不能为空")
    }else{
        document.getElementById("div").style.height=val+'px';
    }
}
function gbtext() {
    var val = document.getElementById("text").value;
    document.getElementById("b").innerText = val;
}
function ycb() {
    document.getElementById("b").style.display = "none";
}
function ycdiv() {
    document.getElementById("div").style.display = "none";
}
function xsb() {
    document.getElementById("b").style.display = "block";
}
function xsdiv() {
    document.getElementById("div").style.display = "block";
    document.getElementById("b").style.display = "block"
}
function firm(){
    var yesorno = window.confirm("您确定取消所有设置么?")
    if(yesorno==true){
        window.location.replace("tzy1.html");
    }else{
        alert("没事瞎点什么！！！")
    }
}

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