JavaScript 非同步方法呼叫隊列鏈實現程式碼分析(1/3)

 代碼如下:

(function() {
function _$(els) {
this.elements = [];
for (var i = 0, len = els.length; i < len; ++i) {
var element = els[i];
if (typeof element == 'string') {
element = document.getElementById(element);
}
this.elements.push(element);
}
};
_$.prototype = {
each: function(fn) {
for ( var i = 0, len = this.elements.length; i < len; ++i ) {
fn.call(this, this.elements[i]);
}
return this;
},
setStyle: function(prop, val) {
this.each(function(el) {
el.style[prop] = val;
});
return this;
},
show: function() {
var that = this;
this.each(function(el) {
that.setStyle('display', 'block');
});
return this;
},
addEvent: function(type, fn) {
var add = function(el) {
if (window.addEventListener) {
el.addEventListener(type, fn, false);
}
else if (window.attachEvent) {
el.attachEvent('on'+type, fn);
}
};
this.each(function(el) {
add(el);
});
return this;
}
};
window.$ = function() {
return new _$(arguments);
};
})();

 

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