var merchantNum = $("#merchantNum").val();
if (merchantNum == null || merchantNum == "") {
alert("数量不能为空");
return false;
}
else if (!(/(^[1-9]\d*$)/.test(merchantNum))) {
alert("数量不是正整数!!!");
return false;
}
js check can only be a positive integer
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Origin blog.csdn.net/qq_30757161/article/details/97519642
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