Checking if a button exists

I have a .js file that is invoked by a few .jsp pages. What I need to do in this particular .js file is to invoke a certain function only if the 'save' button is present in the .jsp page. How do I check if the the button exists? Currently in the .js file the button is refered to this way: $('button[id=save]')

How do I check if such a button exists? Hope someone can advise. Thanks.

---

尝试这样的事情

    $(document).ready(function(){
        //javascript
        if(document.getElementById('save')){
            //your code goes here
        }

        //jquery
        if($('#save').length){
            //your code goes here
        }
    });

---

你可以这样做：

if($('#save').length > 0){
    // Button exists
} else {
    // Button is not present in the DOM yet

}

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