<script>
window.onload=function(){
var str = "满100元减30元";
var res = str.split("减")[1];
var num = res.replace(/[^0-9]/ig,"");
console.log(num); //30
}
</script>
js提取字符串里的数字
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转载自blog.csdn.net/milli236/article/details/82978251
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