javascript吧 关注：269,156贴子：906,493
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<!DOCTYPE html>
<html>
<body>
<select id="s1">
<option value="aaa">aaa</option>
<option value="bbb">bbb</option>
<option value="ccc">ccc</option>
<option value="ddd">ddd</option>
</select>
<select id="s2">
<option value="111">111</option>
<option value="222">222</option>
<option value="333">333</option>
<option value="444">444</option>
</select>
<script>
var s1 = document.getElementById('s1');
var s2 = document.getElementById('s2');
s1.onchange = function() {
s2.value = ((this.value == 'aaa') ? '111':
(this.value == 'bbb') ? '222':
(this.value == 'ccc') ? '333':
(this.value == 'ddd') ? '444':
null);
};
</script>
</body>
</html>
<html>
<body>
<select id="s1">
<option value="aaa">aaa</option>
<option value="bbb">bbb</option>
<option value="ccc">ccc</option>
<option value="ddd">ddd</option>
</select>
<select id="s2">
<option value="111">111</option>
<option value="222">222</option>
<option value="333">333</option>
<option value="444">444</option>
</select>
<script>
var s1 = document.getElementById('s1');
var s2 = document.getElementById('s2');
s1.onchange = function() {
s2.value = ((this.value == 'aaa') ? '111':
(this.value == 'bbb') ? '222':
(this.value == 'ccc') ? '333':
(this.value == 'ddd') ? '444':
null);
};
</script>
</body>
</html>
