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                為了讓同一個模塊可以運行在前后端,在寫作過程中需要考慮兼容前端也實現了模塊規范的環境。為了保持前后端的一致性,類庫開發者需要將類庫代碼包裝在一個閉包內。以下代碼演示如何將 hello()方法定義到不同的運行環境中,它能夠兼容Node、AMD、CMD以及常見的瀏覽器環境中: ~~~ ;(function(name, definition){ //檢測上下文環境是否為AMD或CMD var hasDefine = typeof define === 'function', //檢查上下文環境是否為Node hasExports = typeof module !== 'undefined' && module.exports; if(hasDefine){ // AMD環境或CMD環境 define(definition); }else if(hasExports) { //定義為普通Node模塊 module.exports = definition(); }else{ //將模塊執行結果掛載window變量中,在瀏覽器中this指向window 對象 this[name] = definition(); } })('hello',function(){ var hello = function(){}; return hello; }); ~~~
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