javascript
数组copyWithin（）方法以及JavaScript中的示例
JavaScript copyWithin()方法 (JavaScript copyWithin() method)
copyWithin() method is used to copy the specified elements from an array and replace from specified index within the same array. It changes the this array (actual array).
copyWithin()方法用于從數(shù)組中復(fù)制指定的元素，并從同一數(shù)組中的指定索引進(jìn)行替換。 它將更改此數(shù)組(實際數(shù)組)。
Syntax:
句法：
array.concat(target_index, [start_index], [end_index]);Parameters:
參數(shù)：
target_index is an index in the same array to replace the elements.
target_index是同一數(shù)組中用于替換元素的索引。
start_index is an optional parameter and it's default value is 0, it is used to specify the source start index to copy the elements.
start_index是一個可選參數(shù)，默認(rèn)值為0，用于指定要復(fù)制元素的源起始索引。
end_index is also an optional parameter and it's default value is array.lentgh, it is used to specify the source end index.
end_index也是一個可選參數(shù)，默認(rèn)值為array.lentgh ，用于指定源結(jié)束索引。
Example:
例：
Input:var names = ["Manju", "Amit", "Abhi", "Radib", "Prem"];Function call:names.copyWithin(2, 0);Output:Manju,Amit,Manju,Amit,AbhiJavaScript Code to demonstrate example of Array.copyWithin() method
JavaScript代碼演示Array.copyWithin()方法的示例
<html> <head> <title>JavaScipt Example</title> </head><body><script>var names = ["Manju", "Amit", "Abhi", "Radib", "Prem"];document.write("Before function call...<br>");document.write("names: " + names + "<br>");//copy from 0th index and replace from 2nd indexnames.copyWithin(2);document.write("After function call...<br>");document.write("names: " + names + "<br>"); //another examplevar arr = [10, 20, 30, 40, 50, 60, 70, 80, 90, 100];document.write("Before function call...<br>");document.write("arr: " + arr + "<br>"); //copy from 1st index to 3rd and replace from 6th indexarr.copyWithin(6,1,4);document.write("After function call...<br>");document.write("arr: " + arr + "<br>"); </script> </body> </html>Output
輸出量
Before function call... names: Manju,Amit,Abhi,Radib,Prem After function call... names: Manju,Amit,Manju,Amit,Abhi Before function call... arr: 10,20,30,40,50,60,70,80,90,100 After function call... arr: 10,20,30,40,50,60,20,30,40,100翻譯自: https://www.includehelp.com/code-snippets/array-copyWithin-method-with-example-in-javascript.aspx
總結(jié)
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