我试图提取所有类名以userName_XXX开头的类名
目前我有一个类似这样的代码。 p>
var list = document.querySelectorAll（div [class ^ = userName_]）; var classArr = Array.prototype .map.call（list，function（div）{ return div.className; }）;返回的arr保存所有的用户类。我的问题是有些情况下类不遵循确切的情况。
我会遇到像username_XXX这样的课程，它不会选择它，因为它的大小写敏感。任何人都可以帮我在这里或指向正确的方向吗？
编辑：尝试下面这个。现在仍然是运气。 http：// jsperf / case-insensitive-queryselectorall / 2
解决方案试试这个：
var classes = []，els = document.querySelectorAll（div [class * = userName_]，div [class * = username _]）; for（var i = 0; I< els.length; ++ i）{var match = els [i] .className.match（/（？：^ | \s）（userName_\S {3}）（？：$ | \s）/ i）; if（match）classes.push（match [1]）;} console.log（classes）;
< div class =userName_123>生成userName_123< / div>< div class =userName_1234>生成nothing< / div>< div class = username_abc>产生username_abc< / div>< div class =foo userName_abc bar>产生userName_abc< / div>
I"m trying to extract all class names where the class names begin with "userName_XXX"
Currently I have a code that goes a bit like this.
var list = document.querySelectorAll("div[class^=userName_]"); var classArr = Array.prototype.map.call(list, function(div) { return div.className; });Where the returned arr holds all user classes. My issue is that there are some cases where the classes do not follow the exact case.
So I'll come across a class like this "username_XXX" and it won't pick that up because its case sensitive. Can anyone help me out here or point me in the right direction?
EDIT: Tried following this. Still now luck. jsperf/case-insensitive-queryselectorall/2
解决方案Try this:
var classes = [], els = document.querySelectorAll("div[class*=userName_], div[class*=username_]"); for(var i=0; i<els.length; ++i) { var match = els[i].className.match(/(?:^|\s)(userName_\S{3})(?:$|\s)/i); if(match) classes.push(match[1]); } console.log(classes);<div class="userName_123">Produces "userName_123"</div> <div class="userName_1234">Produces nothing</div> <div class="username_abc">Produces "username_abc"</div> <div class="foo userName_abc bar">Produces "userName_abc"</div>
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