Javascript中实现trim()函数的两种方法

<script language=”javascript”>
/
删除左右两端的空格
/
String.prototype.trim=function()
{
     return this.replace(/(^\s)|(\s$)/g, ”);
}
/
删除左边的空格
/
String.prototype.ltrim=function()
{
     return this.replace(/(^\s)/g,”);
}
/
删除右边的空格
/
String.prototype.rtrim=function()
{
     return this.replace(/(\s$)/g,”);
}
</script>

<script type=”text/javascript”>
alert(document.getElementById('abc').value.trim());
alert(document.getElementById('abc').value.ltrim());
alert(document.getElementById('abc').value.rtrim());
</script>

<script type=”text/javascript”>
/
删除左右两端的空格
/
function trim(str)
{
     return str.replace(/(^\s)|(\s$)/g, ”);
}
/
删除左边的空格
/
function ltrim(str)
{
     return str.replace(/(^\s)/g,”);
}
/
删除右边的空格
/
function rtrim(str)
{
     return str.replace(/(\s$)/g,”);
}
</script>

<script type=”text/javascript”>
alert(trim(document.getElementById('abc').value));
alert(ltrim(document.getElementById('abc').value));
alert(rtrim(document.getElementById('abc').value));
</script>