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Update JavaScript_基础.md

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heibaiying 2019-09-14 11:25:35 +08:00 committed by GitHub
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@ -87,7 +87,7 @@ alert(stringValue.substr(3, 7)); // "lo worl"
// 当第一个参数为负值时 // 当第一个参数为负值时
alert(stringValue.slice(-3)); // "rld" 按照规则等价于： slice(8) alert(stringValue.slice(-3)); // "rld" 按照规则等价于： slice(8)
alert(stringValue.substring(-3)); // "hello world" 按照规则等价于： substring(0) alert(stringValue.substring(-3)); // "hello world" 按照规则等价于： substring(0)
alert(stringValue.substr(-3)); // "rld" 按照规则等价于： substr(8) alert(stringValue.substr(-3)); // "rld" 按照规则等价于： substr(8)
// 当第二个参数为负值时 // 当第二个参数为负值时
@ -237,7 +237,7 @@ var colors = ["red", "blue", "green"];
var colors = ["red", "blue", "green"]; var colors = ["red", "blue", "green"];
colors.length = 2; // ["red", "blue"] colors.length = 2; // ["red", "blue"]
colors[colors.length] = "green"; // ["red", "blue", "green"] colors[colors.length] = "green"; // ["red", "blue", "green"]
colors[10] = "black"; // ["red", "blue", "green", empty × 7, "black"] colors[10] = "black"; // ["red", "blue", "green", empty × 7, "black"]
``` ```
@ -269,8 +269,8 @@ ECMAScript 的数组提供了类似栈的特性，能够实现后进先出：
var colors = ["red", "blue", "green"]; var colors = ["red", "blue", "green"];
colors.push("black"); // ["red", "blue", "green", "black"] colors.push("black"); // ["red", "blue", "green", "black"]
colors.pop() // "black" colors.pop() // "black"
colors // ["red", "blue", "green"] colors // ["red", "blue", "green"]
``` ```
**4. 队列方法** **4. 队列方法**