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<body>
<input type="text" id="test" />
<script>
var reg=/^(\d+\*){2}\d+$/
document.getElementById('test').onchange=function(){
var value=this.value;
if(!reg.test(value)){
alert('格式错误');
return false;
}
var ds=value.split('*');
alert((parseInt(ds[0],10)+parseInt(ds[1],10))*(parseInt(ds[1],10)+parseInt(ds[2],10)));
}
</script>
</body>