java script 练习 题目如图 一共两题 求完整代码 谢谢~
2个回答
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<html>
<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE8" />
<META HTTP-EQUIV="Content-Type" CONTENT="text/html;charset=UTF-8" />
<head>
</head>
<script type="text/javascript">
function doSubmit(){
if(document.getElementById("jl").value == "" && document.getElementById("gs").value == "") {
alert("请输入一个数据。");
return false;
}
if(document.getElementById("jl").value !="" && document.getElementById("gs").value != "") {
if(confirm("两个文本框中都有数据,请清空后再进行计算。")){
document.getElementById("jl").value = "" ;
document.getElementById("gs").value = ""
}
}
if(document.getElementById("jl").value == "" && document.getElementById("gs").value != "") {
document.getElementById("jl").value = (document.getElementById("gs").value)/4;
return;
} else if(document.getElementById("gs").value == "" && document.getElementById("jl").value != ""){
document.getElementById("gs").value = (document.getElementById("jl").value)*4;
return;
}
}
function createTable(){
var div = document.getElementById("dd");
var table = document.createElement("table");//创建table
for(var i=1; i < 10; i++) {
var row = table.insertRow();//创建一行
var cell = row.insertCell();//创建一个单元
if(i % 2 != 0) {
cell.style.backgroundColor = "yellow";
cell.width="500px";
}
cell.innerHTML="第" + i + "行";
}
div.appendChild(table);
}
</script>
<body onload = "createTable();">
<input id="jl" type="text">加仑
<input type="button" value="=" onclick="doSubmit();">
<input id="gs" type="text">公升
<br>
<br>
<br>
<div id="dd"></div>
</body>
</html>
<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE8" />
<META HTTP-EQUIV="Content-Type" CONTENT="text/html;charset=UTF-8" />
<head>
</head>
<script type="text/javascript">
function doSubmit(){
if(document.getElementById("jl").value == "" && document.getElementById("gs").value == "") {
alert("请输入一个数据。");
return false;
}
if(document.getElementById("jl").value !="" && document.getElementById("gs").value != "") {
if(confirm("两个文本框中都有数据,请清空后再进行计算。")){
document.getElementById("jl").value = "" ;
document.getElementById("gs").value = ""
}
}
if(document.getElementById("jl").value == "" && document.getElementById("gs").value != "") {
document.getElementById("jl").value = (document.getElementById("gs").value)/4;
return;
} else if(document.getElementById("gs").value == "" && document.getElementById("jl").value != ""){
document.getElementById("gs").value = (document.getElementById("jl").value)*4;
return;
}
}
function createTable(){
var div = document.getElementById("dd");
var table = document.createElement("table");//创建table
for(var i=1; i < 10; i++) {
var row = table.insertRow();//创建一行
var cell = row.insertCell();//创建一个单元
if(i % 2 != 0) {
cell.style.backgroundColor = "yellow";
cell.width="500px";
}
cell.innerHTML="第" + i + "行";
}
div.appendChild(table);
}
</script>
<body onload = "createTable();">
<input id="jl" type="text">加仑
<input type="button" value="=" onclick="doSubmit();">
<input id="gs" type="text">公升
<br>
<br>
<br>
<div id="dd"></div>
</body>
</html>
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