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function kps(){
///^[1-9]\d*$/
alert($("#count").val());
var count1 = $("#count").val();
var inventory = $("#lpinventory").val();
var price = $("#lpprice").val()
if(count1%1 == 0 && count1>0 && count1 <= inventory ){
var total = count1 * price;
$("#lptotal").html(total);
}else{
alert("请输入1~"+inventory+"的整数");
}
}
<div class="form-group">
<label for="inputPassword3" class="col-xs-2 control-label">购买数量</label>
<div class="col-xs-4">
<input type="text" class="form-control" id="count" onkeyup="kps()"
placeholder="请输入购买数量" name="count">
</div>
</div>