- Underscore.JS教程
- Underscore.JS——主頁
- Underscore.JS——概覽
- Underscore.JS——環境設定
- Underscore.JS——迭代集合
- Underscore.JS——處理集合
- Underscore.JS——迭代陣列
- Underscore.JS——處理陣列
- Underscore.JS——函式
- Underscore.JS——對映物件
- Underscore.JS——更新物件
- Underscore.JS——比較物件
- Underscore.JS——實用程式
- Underscore.JS——鏈式
- Underscore.JS實用資源
- Underscore.JS——快速指南
- Underscore.JS——實用資源
- Underscore.JS——討論
Underscore.JS——常量方法
語法
_.constant(value)
constant方法建立了一個函式,該函式返回傳遞為引數的相同值。請參閱以下示例
示例
var _ = require('underscore');
var value = {name: 'Sam'};
//Example 1: Check if constant returns same object
console.log(value === _.constant(value)());
value = 1;
//Example 2: Check if constant returns same object
console.log(value === _.constant(value)());
將上述程式儲存到tester.js中。執行以下命令來執行該程式。
命令
\>node tester.js
輸出
true true
underscorejs_utilities.htm
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