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Update JavaScript_基础.md

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heibaiying 2019-09-14 11:27:23 +08:00 committed by GitHub
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@ -86,14 +86,14 @@ alert(stringValue.substring(3,7)); // "lo w"
alert(stringValue.substr(3, 7)); // "lo worl" 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
alert(stringValue.slice(3, -4)); // "lo w" 按照规则等价于： slice(3,7) alert(stringValue.slice(3, -4)); // "lo w" 按照规则等价于： slice(3,7)
alert(stringValue.substring(3, -4)); // "hel" 按照规则等价于： substring(3,0) alert(stringValue.substring(3, -4)); // "hel" 按照规则等价于： substring(3,0)
alert(stringValue.substr(3, -4)); // ""（空字符串） 按照规则等价于： substr(3,0) alert(stringValue.substr(3, -4)); // ""（空字符串） 按照规则等价于： substr(3,0)
``` ```