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<title>Document</title>
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div { display: inline-block; margin-left: 37%; }
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<input type="text" value="1,2,3,4,5,6,7,8,9,10,11,12,13,14,15">
<span>数字之间用半角逗号 “,” 隔开</span><br/>
<button>求和</button>
<p></p>
</div>
<script>
$("input").keyup(function(e){
this.value = this.value.replace(/[^(\d)|(,)]/,"");
});
$("button").on("click", function(){
var sum = 0;
var op = $("input").val().split(",");
for (var i = 0; i < op.length; i++) {
sum = sum + parseInt(op[i]);
}
$("p").text(sum);
})
</script>
</body>
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