因為是輔助類庫，所以為了兼容所有其他框架和類庫，采用了包裝器的方式對對象進行擴展。D類庫的最主要的內容是針對js常用內置對象的擴展，比如：String,Number,Array,Date等，這些擴展偏於具體的業務邏輯，比如對String擴展的trim方法、對Date擴展的toStr方法等，都是對一些常用但對象本身不支持且框架類庫也不支持或不完整支持的功能擴展。同時通過對應包裝器的包裝我們可以通過鏈式方法來操作對象，最後每個包裝器都提供了拆箱(即還原為原生對象)方法。故包裝器提供的實質是一個裝箱、操作、拆箱的過程。
命名空間：
復制代碼 代碼如下:
var D = {};
部分功能如下：
. String包裝器
復制代碼 代碼如下:
(function(){
//包裝String
D.str = function(s){
if(! (this instanceof y.str))return new y.str(s);
this.val = (s!==undefined) ? s.toString() : "";
};
D.str.prototype = {
//刪除字符串兩邊空白
trim : function(type){
var types = {0:"(^\\s+)|(\\s+$)",1:"^\\s+",2:"\\s+$"};
type = type || 0;
this.val = this.val.replace(new RegExp(types[type],"g"),"");
return this;
},
//重復字符串
repeat : function(n){
this.val = Array(n+1).join(this.val);
return this;
},
//字符串兩邊補白
padding : function(len,dire,str){
if(this.val.length>=len)return this;
dire = dire || 0; //[0代表左邊，1代表右邊]
str = str || " "; //默認為一個空白字符
var adder = [];
for(var i=0,l = len - this.val.length; i<l;i++){
adder.push(str);
}
adder = adder.join("");
this.val = dire ? (this.val + adder) : (adder + this.val);
return this;
},
reverse : function(){
this.val = this.val.split("").reverse().join("");
return this;
},
byteLen : function(){
return this.val.replace(/[^\x00-\xff]/g,"--").length;
},
unBox : function(){
return this.val;
}
};
//alert(D.str(" 123 ").trim().repeat(2).padding(10,0,"x").reverse().unBox());
})();
.Array包裝器
復制代碼 代碼如下:
(function(){
//包裝Array
D.arr = function(arr){
if(!(this instanceof D.arr))return new D.arr(arr);
this.val = arr || [];
};
D.arr.prototype = {
each : function(fn){
for(var i=0,len=this.val.length;i<len;i++){
if(fn.call(this.val[i])===false){
return this;
}
}
return this;
},
map : function(fn){
var copy = [];
for(var i=0,len = this.val.length;i<len;i++){
copy.push(fn.call(this.val[i]));
}
this.val = copy;
return this;
},
filter : function(fn){
var copy = [];
for(var i=0,len=this.val.length;i<len;i++){
fn.call(this.val[i]) && copy.push(this.val[i]);
}
this.val = copy;
return this;
},
remove : function(obj,fn){
fn = fn || function(m,n){
return m===n;
};
for(var i=0,len = this.val.length;i<len;i++){
if(fn.call(this.val[i],obj)===true){
this.val.splice(i,1);
}
}
return this;
},
unique : function(){
var o = {},arr = [];
for(var i=0,len = this.val.length;i<len;i++){
var itm = this.val[i];
(!o[itm] || (o[itm]!==itm) )&& (arr.push(itm),o[itm] = itm);
}
this.val = arr;
return this;
},
indexOf : function(obj,start){
var len = this.val.length,start = ~~start;
start < 0 && (start+= len);
for(;start<len;start++){
if(this.val[start]===obj)return start;
}
return -1;
},
lastIndexOf : function(obj,start){
var len = this.val.length,start = arguments.length === 2 ? ~~start : len-1;
start = start < 0 ? (start+len) : (start>=len?(len-1):start);
for(;start>-1;start--){
if(this.val[start] === obj)return start;
}
return -1;
},
unBox : function(){
return this.val;
}
};
//alert( D.arr(["123",123]).unique().unBox());
//alert(D.arr([1,2,3]).map(function(i){return ++i;}).filter(function(i){return i>2;}).remove(3).unBox());
})();
.Number包裝器
復制代碼 代碼如下:
(function(){
//包裝Number
D.num = function(num){
if(!(this instanceof D.num))return new D.num(num);
this.val = Number(num) || 0;
};
D.num.prototype = {
padZore : function(len){
var val = this.val.toString();
if(val.length>=len)return this;
for(var i=0,l = len-val.length;i<l;i++){
val = "0" + val;
}
return val;
},
floatRound : function(n){
n = n || 0;
var temp = Math.pow(10,n);
this.val = Math.round(this.val * temp)/temp;
return this;
},
unBox : function(){
return this.val;
}
};
//alert(D.num(3.1235888).floatRound(3).unBox());
})();
.Date包裝器
復制代碼 代碼如下:
(function(){
//包裝Date
D.date = function(date){
if(!(this instanceof D.date))return new D.date(date);
if(!(date instanceof Date)){
var d = new Date(date);
this.val = (d == "Invalid Date" || d == "NaN") ? new Date() : new Date(date);
}else{
this.val = date;
}
};
D.date.prototype = {
toStr : function(tpl){
var date = this.val,tpl = tpl || "yyyy-MM-dd hh:mm:ss";
var v = [date.getFullYear(),date.getMilliseconds(),date.getMonth()+1,date.getDate(),date.getHours(),date.getMinutes(),date.getSeconds()];
var k = "MM,M,dd,d,hh,h,mm,m,ss,s".split(",");
var kv = {"yyyy":v[0],"yy":v[0].toString().substring(2),"mmss":("000"+v[1]).slice(-4),"ms":v[1]};
for(var i=2;i<v.length;i++){
kv[k[(i-2)*2]] = ("0" + v[i]).slice(-2);
kv[k[(i-2)*2+1]] = v[i];
}
for(var k in kv){
tpl = tpl.replace(new RegExp( k,"g"),kv[k]);
}
return tpl;
},
unBox : function(){
return this.val;
}
};
//alert(D.date("2017-123-12").toStr("yyyy-MM-dd hh:mm:ss ms-mmss"));
// alert(D.date("2017").unBox());
})();
.最後為了在脫離其他框架類庫的情況下D也可以承擔dom操作方面的任務，實現了Dom包裝器，如下：
復制代碼 代碼如下:
(function(){
2 //包裝Dom
3 D.dom = function(node){
4 if(!(this instanceof D.dom))return new D.dom(node);
5 if(typeof node === "undefined"){
6 node = document.body;
7 }else if(typeof node == "string"){
8 node = document.getElementById(node);
9 !node && (node = document.body);
}else{
!node.getElementById && (node = document.body);
}
this.val = node;
};
D.dom.prototype = {
inner : function(value){
this.val.innerHTML ? (value = value || "",this.val.innerHTML = value) : (value = value || 0,this.val.value = value);
return this;
},
attr : function(k,v){
if(typeof k == "object"){
for(var m in k){
this.val[m] = k[m];
}
}else{
this.val[k] = v;
}
return this;
},
css : function(k,v){
var style = this.val.style;
if(typeof k == "object"){
for(var m in k){
style[m] = k[m];
}
}else{
style[k] = v;
}
return this;
},
addClass : function(cls){
var clsName = " " + this.val.className + " ";
(clsName.indexOf(" " + cls + " ")==-1) && (clsName = (clsName + cls).replace(/^\s+/,""));
this.val.className = clsName;
return this;
},
removeClass : function(cls){
var clsName = " " + this.val.className + " ";
this.val.className = clsName.replace(new RegExp(" "+cls+ " ","g"),"").replace(/(^\s+)|(\s+$)/,"");
return this;
},
addEvent : function(evType,fn){
var that = this, typeEvent = this.val["on"+evType];
if(!typeEvent){
(this.val["on"+evType] = function(){
var fnQueue = arguments.callee.funcs;
for(var i=0;i<fnQueue.length;i++){
fnQueue[i].call(that.val);
}
}).funcs =[fn];
}else{
typeEvent.funcs.push(fn);
}
return this;
},
delEvent : function(evType,fn){
if(fn===undefined){
this.val["on"+evType] = null;
}else{
var fnQueue = this.val["on"+evType].funcs;
for(var i=fnQueue.length-1;i>-1;i--){
if(fnQueue[i] === fn){
fnQueue.splice(i,1);
break;
}
}
fnQueue.length==0 && (this.val["on"+evType] = null);
}
return this;
},
unBox : function(){
return this.val;
}
};
//靜態方法
var __ = D.dom;
__.$ = function(id){
return typeof id == "string" ? document.getElementById(id) : id;
};
__.$$ = function(tag,box){
return (box===undefined?document:box).getElementsByTagName(tag);
};
__.$cls = function(cls,tag,node){
node = node === undefined ? document : node;
cls = cls.replace(/(\.)|(^\s+)|(\s+$)/g,"");
if(node.getElementsByClassName)return node.getElementsByClassName(cls);
tag = tag === undefined ? "*" : tag;
var filter = [], nodes = (tag==="*" && node.all) ? node.all : node.getElementsByTagName(tag);
for(var i=0,j=nodes.length;i<j;i++){
nodes[i].nodeType==1 && ((" " + nodes[i].className + " ").indexOf(" "+cls+ " ")!=-1) && filter.push(nodes[i]);
}
return filter;
};
//靜態方法結束
alert(D.dom.$cls(".abc").length);
})();
Dom包裝器的實例對象負責當前dom節點的自身操作。而"靜態方法"部分則是提供了dom選擇器的基本實現。
以上就是D類庫的初級版本，其中的重要部分——對內置對象的擴展目前只有較少的方法擴展，比如對Number的擴展，在基於web的財務軟件中，用到相當多的數字操作，其中有一些是常用處理，就可以將其添加入Number包裝器，好處也是顯而易見的。
最後如果你看到了這篇文章，也有足夠的想法，我希望你能盡你所能來給於包裝器更多的方法擴展，你的其中的一些主意可能會成為D成熟版本的一部分。