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javascript 搜索关键字高亮并不区分大小写
简介 搜索关键字的时候 ，高亮关键字，并不区分字母大小写
<h2><span class="ql-size-large"> </span><span style="color:rgb(86, 156, 214);" class="ql-size-large">function</span><span class="ql-size-large"> </span><span style="color:rgb(220, 220, 170);" class="ql-size-large">heightLight </span><span class="ql-size-large">(</span><span style="color:rgb(156, 220, 254);" class="ql-size-large">val</span><span class="ql-size-large">) {</span></h2><h2><span class="ql-size-large"> </span><span style="color:rgb(86, 156, 214);" class="ql-size-large">const</span><span class="ql-size-large"> </span><span style="color:rgb(79, 193, 255);" class="ql-size-large">reg</span><span class="ql-size-large"> = </span><span style="color:rgb(86, 156, 214);" class="ql-size-large">new</span><span class="ql-size-large"> </span><span style="color:rgb(78, 201, 176);" class="ql-size-large">RegExp</span><span class="ql-size-large">(</span><span style="color:rgb(86, 156, 214);" class="ql-size-large">this</span><span class="ql-size-large">.</span><span style="color:rgb(156, 220, 254);" class="ql-size-large">searchVal</span><span class="ql-size-large">, </span><span style="color:rgb(206, 145, 120);" class="ql-size-large">'gi'</span><span class="ql-size-large">)</span></h2><h2><span class="ql-size-large"> </span><span style="color:rgb(156, 220, 254);" class="ql-size-large">val</span><span class="ql-size-large"> = </span><span style="color:rgb(156, 220, 254);" class="ql-size-large">val</span><span class="ql-size-large">.</span><span style="color:rgb(220, 220, 170);" class="ql-size-large">replace</span><span class="ql-size-large">(</span><span style="color:rgb(79, 193, 255);" class="ql-size-large">reg</span><span class="ql-size-large">, </span><span style="color:rgb(86, 156, 214);" class="ql-size-large">function</span><span class="ql-size-large"> (</span><span style="color:rgb(156, 220, 254);" class="ql-size-large">txt</span><span class="ql-size-large">) {</span></h2><h2><span class="ql-size-large"> </span><span style="color:rgb(197, 134, 192);" class="ql-size-large">return</span><span class="ql-size-large"> </span><span style="color:rgb(206, 145, 120);" class="ql-size-large">'<span class="theme">'</span><span class="ql-size-large"> + </span><span style="color:rgb(156, 220, 254);" class="ql-size-large">txt</span><span class="ql-size-large"> + </span><span style="color:rgb(206, 145, 120);" class="ql-size-large">'</span>'</span></h2><h2><span class="ql-size-large"> })</span></h2><h2><span class="ql-size-large"> </span><span style="color:rgb(197, 134, 192);" class="ql-size-large">return</span><span class="ql-size-large"> </span><span style="color:rgb(156, 220, 254);" class="ql-size-large">val</span></h2><h2><span class="ql-size-large"> }</span></h2>
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