// An object is a collection of name/value pairs, or a string to value map. let book = { // Objects are enclosed in curly braces. topic: "JavaScript", // The property "topic" has value "JavaScript." edition: 7 // The property "edition" has value 7 }; // The curly brace mark...
// JavaScript's most important datatype is the object.// An object is a collection of name/value pairs, or a string to value map.letbook = {// Objects are enclosed in curly braces.topic:"JavaScript",// The property "topic" has value "JavaScript."edition:7// The property "edition" ...
AI代码解释 consttoRGB=(hex)=>hex.replace(/^#?([a-f\d])([a-f\d])([a-f\d])$/i,(_,r,g,b)=>`#${r}${r}${g}${g}${b}${b}`).substring(1).match(/.{2}/g).map((x)=>parseInt(x,16)); 21、如何将 RGB 转换为 HEX...
Thesubstring()method does not change the original string. If start is greater than end, arguments are swapped: (4, 1) = (1, 4). Start or end values less than 0, are treated as 0. See Also: The split() Method The slice() Method ...
in chunks as they arrive, specify a* function as the third argument. The chunks will be passed, as Uint8Array* objects, to this processChunk callback.** streamBody() returns a Promise that resolves to a string. If a processChunk* callback was supplied then this string is the ...
A string specifying the communications port that the server uses. 属性源 Location 实现版本 Navigator 2.0 安全性 Navigator 3.0:该属性默认是带有污点的。有关数据污点的更多信息,请看“JavaScript 的安全性”。 描述 The port property specifies a portion of the URL. The port property is a substring of...
substring() Returns a part of the string from the specified start index (inclusive) to the end index (exclusive). slice() Returns a part of the string from the specified start index (inclusive) to the end index (exclusive). toLowerCase() Returns the passed string in lowercase. toUpperCase...
Let's take a look at an example of how to use the substring() method in JavaScript. For example: vartotn_string='TechOnTheNet';console.log(totn_string.substring(0,4));console.log(totn_string.substring(4,6));console.log(totn_string.substring(6,9));console.log(totn_string.substring...
alert("The last index of n is: " + concatString.lastIndexOf("n")); // A regular expression is used to locate and replace the substring var newString = concatString.replace(/Tony/gi,"General"); // The following yields Please salute General Patton ...
"some word".substring(x, y); 12.通过一个具体的,区分大小写的名称定义一个变量。一旦您用特定名称创建(或声明)一个变量,然后你可以通过这个变量名来获取这个值。 varvarName = data; 13.一个函数接受输入,并做一些处理后,产生输出。 //函数看起来就像是这样的:vardivideByThree =function(number) {varval...