jQuery method to determine whether the object with the specified id exists_jquery

jQuery determines whether the object with the specified id exists. It only needs to determine whether the length of the object is greater than 0.

Example:

The correct way to write the judgment is as follows:

if($("#object_id").length>0)
{
  alert('对象存在');
}
else
{
  alert('对象不存在');
}

Or directly use native Javascript code to judge:

if(document.getElementById("id"))
{
alert('对象存在');
}
 else
{
alert('对象不存在');
} 

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