Javascript,输出结果后页面保持刷新
我有个小问题 我正在学习Javascript,我决定制作一个货币转换器,但在显示数据后,我的页面会不断刷新 有人能帮我弄清楚为什么会这样吗?谢谢 网站:Javascript,输出结果后页面保持刷新,javascript,html,css,forms,Javascript,Html,Css,Forms,我有个小问题 我正在学习Javascript,我决定制作一个货币转换器,但在显示数据后,我的页面会不断刷新 有人能帮我弄清楚为什么会这样吗?谢谢 网站: *{字体大小:13px;字体系列:arial;背景色:黑色;颜色:白色;填充:0;边距:0;} #包装{宽度:640px;边距:0px自动;} 输入{颜色:石灰;宽度:150px;高度:22px;} #货币转换,标签:第n个子(3){位置:相对;顶部:100px;右侧:95px;} #我的货币{宽度:53px;高度:22px;位置:相对;顶部
*{字体大小:13px;字体系列:arial;背景色:黑色;颜色:白色;填充:0;边距:0;}
#包装{宽度:640px;边距:0px自动;}
输入{颜色:石灰;宽度:150px;高度:22px;}
#货币转换,标签:第n个子(3){位置:相对;顶部:100px;右侧:95px;}
#我的货币{宽度:53px;高度:22px;位置:相对;顶部:100px;左侧:232px;}
#转换的_输入,标签:第n个子(5){位置:相对;顶部:134px;右侧:298px;}
#转换货币{宽度:53px;高度:22px;位置:相对;顶部:134px;左侧:175px;}
#提交按钮{宽度:52px;高度:25px;位置:相对;顶部:117px;右侧:230px;}
函数输出_值(){
var my_input=Number(document.getElementsByName(“用户输入”)[0].value);
var my_输出;
var my_currency=document.conversions.currency_to_convert.value;
var convert_to=document.convertions.convert_currency_to.value;
如果(我的货币=“美元”){
如果(将_转换为==“CAD”){
my_输出=my_输入*0.975;
document.getElementsByName(“转换输出”)[0]。value=my\u输出;
}否则,如果(将欧元换算为=“欧元”){
my_输出=my_输入*0.775;
document.getElementsByName(“转换输出”)[0]。value=my\u输出;
}else if(将_转换为==“GBP”){
my_输出=my_输入*0.620;
document.getElementsByName(“转换输出”)[0]。value=my\u输出;
}else if(将_转换为==“AUD”){
my_输出=my_输入*0.956;
document.getElementsByName(“转换输出”)[0]。value=my\u输出;
}否则{
警告(“您不能转换相同的货币。”);
}
}否则如果(我的货币==“CAD”){
如果(将单位换算为=“美元”){
my_输出=my_输入*1.025;
document.getElementsByName(“转换输出”)[0]。value=my\u输出;
}否则,如果(将欧元换算为=“欧元”){
my_输出=my_输入*0.795;
document.getElementsByName(“转换输出”)[0]。value=my\u输出;
}else if(将_转换为==“GBP”){
my_输出=my_输入*0.636;
document.getElementsByName(“转换输出”)[0]。value=my\u输出;
}else if(将_转换为==“AUD”){
my_输出=my_输入*0.980;
document.getElementsByName(“转换输出”)[0]。value=my\u输出;
}否则{
警告(“您不能转换相同的货币。”);
}
}否则,如果(我的欧元=“欧元”){
如果(将单位换算为=“美元”){
my_输出=my_输入*1.289;
document.getElementsByName(“转换输出”)[0]。value=my\u输出;
}else if(将_转换为==“CAD”){
my_输出=my_输入*1.257;
document.getElementsByName(“转换输出”)[0]。value=my\u输出;
}else if(将_转换为==“GBP”){
my_输出=my_输入*0.800;
document.getElementsByName(“转换输出”)[0]。value=my\u输出;
}else if(将_转换为==“AUD”){
my_输出=my_输入*1.233;
document.getElementsByName(“转换输出”)[0]。value=my\u输出;
}否则{
警告(“您不能转换相同的货币。”);
}
}否则,如果(我的欧元==“英镑”){
如果(将单位换算为=“美元”){
my_输出=my_输入*1.610;
document.getElementsByName(“转换输出”)[0]。value=my\u输出;
}否则,如果(将欧元换算为=“欧元”){
my_输出=my_输入*1.249;
document.getElementsByName(“转换输出”)[0]。value=my\u输出;
}else if(将_转换为==“CAD”){
my_输出=my_输入*1.571;
document.getElementsByName(“转换输出”)[0]。value=my\u输出;
}else if(将_转换为==“AUD”){
my_输出=my_输入*1.541;
document.getElementsByName(“转换输出”)[0]。value=my\u输出;
}否则{
警告(“您不能转换相同的货币。”);
}
}否则,如果(我的货币==“澳元”){
如果(将单位换算为=“美元”){
my_输出=my_输入*1.045;
document.getElementsByName(“转换输出”)[0]。value=my\u输出;
}否则,如果(将欧元换算为=“欧元”){
my_输出=my_输入*0.810;
document.getElementsByName(“转换输出”)[0]。value=my\u输出;
}else if(将_转换为==“GBP”){
my_output=my_input*0.648;
document.getElementsByName(“转换输出”)[0]。value=my\u输出;
}else if(将_转换为==“CAD”){
my_输出=my_输入*1.019;
document.getElementsByName(“转换输出”)[0]。value=my\u输出;
}否则{
警告(“您不能转换相同的货币。”);
}
}否则{
警报(“致命错误,刷新页面”);
}
}
美元
计算机辅助设计
欧元
英镑
澳元
<!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>
<style type="text/css">
* {font-size:13px;font-family:arial;background-color:black;color:white;padding:0;margin:0;}
#wrapper {width:640px;margin:0px auto;}
input {color:lime;width:150px;height:22px;}
#money_to_convert, label:nth-child(3) {position:relative;top:100px;right:95px;}
#my_currency {width:53px;height:22px;position:relative;top:100px;left:232px;}
#converted_input, label:nth-child(5) {position:relative;top:134px;right:298px;}
#convert_currency {width:53px;height:22px;position:relative;top:134px;left:175px;}
#submit_button {width:52px;height:25px;position:relative;top:117px;right:230px;}
</style>
<script type="text/javascript">
function output_value() {
var my_input = Number(document.getElementsByName("user_input")[0].value);
var my_output;
var my_currency = document.convertions.currency_to_convert.value;
var convert_to = document.convertions.convert_currency_to.value;
if(my_currency == "USD"){
if(convert_to == "CAD"){
my_output = my_input * 0.975;
document.getElementsByName("convertion_output")[0].value = my_output;
}else if(convert_to == "EUR"){
my_output = my_input * 0.775;
document.getElementsByName("convertion_output")[0].value = my_output;
}else if(convert_to == "GBP"){
my_output = my_input * 0.620;
document.getElementsByName("convertion_output")[0].value = my_output;
}else if(convert_to == "AUD"){
my_output = my_input * 0.956;
document.getElementsByName("convertion_output")[0].value = my_output;
}else{
alert("You can't convert the same currency.");
}
}else if(my_currency == "CAD"){
if(convert_to == "USD"){
my_output = my_input * 1.025;
document.getElementsByName("convertion_output")[0].value = my_output;
}else if(convert_to == "EUR"){
my_output = my_input * 0.795;
document.getElementsByName("convertion_output")[0].value = my_output;
}else if(convert_to == "GBP"){
my_output = my_input * 0.636;
document.getElementsByName("convertion_output")[0].value = my_output;
}else if(convert_to == "AUD"){
my_output = my_input * 0.980;
document.getElementsByName("convertion_output")[0].value = my_output;
}else{
alert("You can't convert the same currency.");
}
}else if(my_currency == "EUR"){
if(convert_to == "USD"){
my_output = my_input * 1.289;
document.getElementsByName("convertion_output")[0].value = my_output;
}else if(convert_to == "CAD"){
my_output = my_input * 1.257;
document.getElementsByName("convertion_output")[0].value = my_output;
}else if(convert_to == "GBP"){
my_output = my_input * 0.800;
document.getElementsByName("convertion_output")[0].value = my_output;
}else if(convert_to == "AUD"){
my_output = my_input * 1.233;
document.getElementsByName("convertion_output")[0].value = my_output;
}else{
alert("You can't convert the same currency.");
}
}else if(my_currency == "GBP"){
if(convert_to == "USD"){
my_output = my_input * 1.610;
document.getElementsByName("convertion_output")[0].value = my_output;
}else if(convert_to == "EUR"){
my_output = my_input * 1.249;
document.getElementsByName("convertion_output")[0].value = my_output;
}else if(convert_to == "CAD"){
my_output = my_input * 1.571;
document.getElementsByName("convertion_output")[0].value = my_output;
}else if(convert_to == "AUD"){
my_output = my_input * 1.541;
document.getElementsByName("convertion_output")[0].value = my_output;
}else{
alert("You can't convert the same currency.");
}
}else if(my_currency == "AUD"){
if(convert_to == "USD"){
my_output = my_input * 1.045;
document.getElementsByName("convertion_output")[0].value = my_output;
}else if(convert_to == "EUR"){
my_output = my_input * 0.810;
document.getElementsByName("convertion_output")[0].value = my_output;
}else if(convert_to == "GBP"){
my_output = my_input * 0.648;
document.getElementsByName("convertion_output")[0].value = my_output;
}else if(convert_to == "CAD"){
my_output = my_input * 1.019;
document.getElementsByName("convertion_output")[0].value = my_output;
}else{
alert("You can't convert the same currency.");
}
}else{
alert("Fatal Error, refresh the page.");
}
}
</script>
</head>
<body>
<div id="wrapper">
<form name="convertions">
<select name="currency_to_convert" id="my_currency">
<option value="USD" selected>USD</option>
<option value="CAD">CAD</option>
<option value="EUR">EUR</option>
<option value="GBP">GBP</option>
<option value="AUD">AUD</option>
</select>
<select name="convert_currency_to" id="convert_currency">
<option value="USD">USD</option>
<option value="CAD" selected>CAD</option>
<option value="EUR">EUR</option>
<option value="GBP">GBP</option>
<option value="AUD">AUD</option>
</select>
<label for="user_input">Amount:</label>
<input type="text" name="user_input" id="money_to_convert" />
<label for="convertion_output">Result:</label>
<input type="text" name="convertion_output" id="converted_input" disabled="disabled" />
<button onclick="output_value()" id="submit_button">Submit</button>
</form>
</div>
</body>
</html>
<button onclick="output_value()" type="button" id="submit_button">
<button onclick="output_value(); return false" id="submit_button">
<form name="convertions" onsubmit="return output_value(this)">
...
<button>Submit</button>
function output_value(form) {
// var my_currency = document.convertions.currency_to_convert.value;
var my_currency = form.currency_to_convert.value;
// and so on
...
alert("Fatal Error, refresh the page.");
// reset the form
form.reset();
// stop the form submitting
return false;
}
/* USD to... */
var rates = {
USD: 1,
CAD: 0.975,
EUR: 0.775,
GBP: 0.620,
AUD: 0.956
};
function output_value() {
var my_input = parseFloat(document.getElementsByName("user_input")[0].value);
var my_currency = document.convertions.currency_to_convert.value;
var convert_to = document.convertions.convert_currency_to.value;
var output = document.getElementsByName('convertion_output')[0];
// side note. "conversion" is spelt with an 's' not a t.
output.value = my_input / rates[my_currency] * rates[convert_to];
}