输入字段的默认值（jQuery版本）

Posted 2021-02-25

See also the [plain javascript version](http://snipplr.com/view/41717/default-value-for-input-fields/).

var elem = $(':text');
 
// delete default value on focus
elem.focus(function()
{
	if ( this.value == this.defaultValue )
	{
		this.value = '';
	}
});
 
// regain default value on blur
elem.blur(function()
{
	if ( this.value == '' )
	{
		this.value = this.defaultValue;
	}
});