js中对字符串(String)去除空格

<pre style="margin-top: 10px; margin-bottom: 20px; white-space: pre-wrap; overflow-wrap: break-word; line-height: 2 !important;">str为要去除空格的字符串:
去除所有空格:
str = str.replace(/\s+/g,"");
去除两头空格:
str = str.replace(/^\s+|\s+)/g, "");

SCRIPT LANGUAGE="JavaScript">

</SCRIPT>
<input type="text" value=" 前后都是空格 " id="space">
<input type="button" value="去前后空格" onclick="javascript:document.getElementById('space').value=document.getElementById('space').value.Trim();document.getElementById('space').select();">
<input type="button" value="去前空格" onclick="javascript:document.getElementById('space').value=document.getElementById('space').value.LTrim();document.getElementById('space').select();">
<input type="button" value="去后空格" onclick="javascript:document.getElementById('space').value=document.getElementById('space').value.RTrim();document.getElementById('space').select();">
<input type="button" value="还原" onclick="javascript:document.getElementById('space').value=' 前后都是空格 ';">
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去除所有空格:
str = str.replace(/\s+/g,"");
去除两头空格:
str = str.replace(/^\s+|\s+|^\s+/g,"");</pre>