<script>
function selectAll()
{
var opt = document.getElementById("mulselect");
for(i=0;i<opt.length;i++)
{
opt[i].selected = true;
}
}
</script>
<select id="mulselect" multiple size=10>
<option>1
<option>2
<option>3
<option>4
</select>
<button onclick="selectAll()">select all</button>
function selectAll()
{
var opt = document.getElementById("mulselect");
for(i=0;i<opt.length;i++)
{
opt[i].selected = true;
}
}
</script>
<select id="mulselect" multiple size=10>
<option>1
<option>2
<option>3
<option>4
</select>
<button onclick="selectAll()">select all</button>
解决方案 »
免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货