详解Javascript trim()函数实现

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

scripttype=”text/javascript”
alert(document.getElementById(’abc’).value.trim());
alert(document.getElementById(’abc’).value.ltrim());
alert(document.getElementById(’abc’).value.rtrim());
/script