如何更新像facebook这样的文档标题并正确删除它？

Question

在Facebook上收到通知时,文档标题将自动更新

(1)Facebook

如何用javascript做到这一点？

更新: 我想知道如何插入(N)并在用户单击指定的div时将其删除.

Answer 1

有一种简单的方法来更新文档标题:

document.title = 'My new title';

这是一个代码段,它将在新通知可用时更新标题,并在用户单击#foodiv 时再次更新(删除新通知的数量).

var title = document.title;
var notifications = 0;
jQuery.post(url, data, function(response) {


    // this regex will test if the document title already has a notification count in it, e.g. (1) My Document
    if (/\([\d]+\)/.test(title)) {
        // we will split the title after the first bracket
        title = title.split(') ');
        // get the first part of the splitted string and save it - this will be the count of the unseen notifications in our document string
        notifications = title[0].substring(1);

        // only proceed when the notification count is difference to our ajax request
        if (notifications == response)
            return;
        // else update the title with the new notification count
        else
            document.title = '(' + sp_response + ') ' + title[1];   
    }   
    // when the current document title does not contain any notification count, just update it
    else {
        document.title = '(' + sp_response + ') ' + title;
    }

});

jQuery('#foo').click(function(event){
    var title = document.title;
    if (/\([\d]+\)/.test(title)) {
        title = title.split(') ');
        document.title = title[1];  
    }
});