<script>var str="chrome/54.0.2840.71 safari/537.36 ";
var patt1=/chrome\/[\d.]+/;document.write(str.match(patt1));</script>這里的[],+但代表什么意思。var patt1=/chrome\/\d.+/;如果這樣寫會輸出chrome/54.0.2840.71 safari/537.36，而加上[]就會只輸出chrome/54.0.2840.71
正則表達式的[] +
呼喚遠方
2018-09-07 11:31:09