jquery Add extension Method (Understanding $.extend (), different from $.fn.extend () method)

Understanding $.extend (), different from the $.fn.extend () method

1.$.extend () method

The $.extend () method has two uses in jquery, the first being an extension method,

The second method is

Jquery.extend ([deep], Target, Object1, [objectn])

return value: Object

Merging 2 objects to get new target,deep is optional (recursive merge)

Merge settings and options, modify and return settings.

JQuery Code:

var settings = { validate: false, limit: 5, name: "foo" };var options = { validate: true, name: "bar" };jQuery.extend(settings, options);

Results:

settings == { validate: true, limit: 5, name: "bar" }

Describe:

Merge defaults and options without modifying the defaults.

JQuery Code:

var empty = {};var defaults = { validate: false, limit: 5, name: "foo" };var options = { validate: true, name: "bar" };var settings = jQuery.extend(empty, defaults, options);

Results:

settings == { validate: true, limit: 5, name: "bar" }empty == { validate: true, limit: 5, name: "bar" }

Extension in 2:

First, look at the code.

$(function(){            jQuery.extend({                modalshow: function(options) {                    vardefaults = {                        triggerID: ‘LoginShow‘,                        callback: function() { }                    }<br>　　　　　　　//这里是$.extend的第二种用法<br>　　　　　　　var opts = $.extend({},defaults, options);                    if ($("#"+ opts.triggerID)[0] == null) {                        var$triggerBTN = $(‘<input type="button" value="LoginShow" id=‘+ opts.triggerID + ‘/>‘);                        $triggerBTN.bind("click", function() {                            alert(opts.triggerID);                        });                        $("body").append($triggerBTN);                    } else{                        $("#"+ opts.triggerID).bind("click", function() {                            alert(opts.triggerID);                        })                    }                }            });            $.modalshow();//这里是调用的地方,id为‘loginshow‘的button可以先不再HTML中添加可以自动生成        })

The second type of extension

$(function(){            jQuery.fn.extend({                modalshow: function(options) {                    vardefaults = {                        //这里的this是JQuery对象                        triggerID: this.attr("id"),                        callback: function() { }                    }<br>　　　　　　   //这里是$.extend的第二种用法<br>　　　　　　   var opts = $.extend(defaults, options);                    $("#"+ opts.triggerID).bind("click", function() {                          alert(opts.triggerID);                    })                }            });            $("#loginShow").modalshow();//这里是调用的地方，这里需要先在HTML中加入元素        })

jquery Add extension Method (Understanding $.extend (), different from $.fn.extend () method)