javascript trim space removal function implementation code_javascript skills

<input type="text" name="mytxt" value=" 12345678 "> <input type="button" name="cmd1" onclick="mytxt2.value=mytxt.value.trim()" value="去两边的空格"> <input type="text" name="mytxt2"> <input type="button" name="cmd1" onclick="mytxt3.value=mytxt.value.ltrim()" value="去左边的空格"> <input type="text" name="mytxt3"> <input type="button" name="cmd1" onclick="mytxt4.value=mytxt.value.rtrim()" value="去右边的空格"> <input type="text" name="mytxt4">
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