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var a=8;
var b=-2;
alert((a^b)>0?"同":"异")
<script type="text/javascript">
var a = 1, b = 2;
alert(b>>>31 ^ a>>>31);
var a = -1, b = 2;
alert(b>>>31 ^ a>>>31);
var a = -1, b = -2;
alert(b>>>31 ^ a>>>31);
</script>
var a=8;
var b=-2;
alert(a>>31==b>>31?"同":"异")