TA貢獻2021條經驗 獲得超8個贊
受邀前來，時間有限，簡單寫一下思路：
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<form action="#" id="form">
<select id="content" name="selse" >
<option value="x">設置x軸值</option>
<option value="y">設置y軸值</option>
</select>
<input type="text" id="text">
<button>提交</button>
</form>
<script>
var form = document.getElementById('form');
var sub_btn = document.getElementById('sub_btn');
var content = document.getElementById('content');
var text = document.getElementById('text');
form.onsubmit = function(){
var index=content.selectedIndex;
if(content.options[index].value == 'x'){
text.value = 'QWE:'+text.value+'';
}else{
text.value = 'ASD:'+text.value+'';
}
console.log(text.value);
}
</script>
</body>
</html>
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