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                # Lesson-3 === 修改f(selector) 里的判斷,新增domReady 我們知道在jQuery中還有一種選擇器寫法 ```javascript $(function() { }); ``` 在dom加載完畢后馬上就執行,這樣的方法會比onload更快,所以domReady對于我們來說一定是必不可少的 我們在init方法中要新增以下判斷 ```javascript if(!selector) { return this; } if (typeof selector == 'object') { var selector = [selector]; for (var i = 0; i < selector.length; i++) { this[i] = selector[i]; } this.length = selector.length; return this; } else if (typeof selector == 'function') { Kodo.ready(selector); return; } ``` 首先selector可能為object的情況,比如傳入的是原生dom對象,dom數組對象. 另外要記得轉為數組`var selector = [selector]; 因為有可能是一個元素比如是window,document等否則沒法循環 然后selector如果是function那我們就認為他是domReady PS:在這我判斷的并沒有非常的全面,僅僅具備了基礎功能 ```javascript Kodo.ready = function(fn) { doc.addEventListener('DOMContentLoaded',function() { fn && fn(); },false); doc.removeEventListener('DOMContentLoaded',fn,true); }; ``` 然后這個是ready的源碼,由于我們只兼容高端瀏覽器所以僅僅需要這樣寫即可. 既然你都看到這了,還不給我一個star說得過去么你!! :(
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