复选框半选

<script for="c" event="onclick">

if (event.srcElement.m=='')

for(var i=1;i<c.length;i++)

c[i].checked=c[0].checked;

else{

var tmp1 = true, tmp2 = false

for(var i=1;i<c.length;i++)

tmp1 &= c[i].checked, tmp2 |= c[i].checked;

c[0].checked = tmp1;

c[0].indeterminate = !tmp1 && tmp2;

}

</script>

 

<table border>

<tr><td><input type="checkbox" name="c" m></td></tr>

<tr><td><input type="checkbox" name="c"></td></tr>

<tr><td><input type="checkbox" name="c"></td></tr>

<tr><td><input type="checkbox" name="c"></td></tr>

<tr><td><input type="checkbox" name="c"></td></tr>

</table>