Examples of push () and join () functions in JavaScript, pushjoin

Examples of push () and join () functions in JavaScript, pushjoin

Definition and usage

The push method can add one or more elements to the end of an array and return a new length.

The join method is used to add all elements in the array to a specified string. The elements are separated by the specified separator.

Syntax

arrayObject.push(newelement1,newelement2,....,newelementX)arrayObject.join(separator)。

The parameter description is required for newelement1. The first element to be added to the array. Newelement2 is optional. The second element to be added to the array. NewelementX is optional. You can add multiple elements.

The parameter description separator is spliced by "," by default. You can also specify the separator to be used.

Example:

var arr = [1,2];console.log("arrBegin-->"+arr);alert(arr.push(3,4));console.log("arrNew-->"+arr);var joinStr = arr.join();console.log("joinStr1--->"+joinStr);var joinStr = arr.join("");console.log("joinStr2--->"+joinStr);var joinStr = arr.join(".");console.log("joinStr3--->"+joinStr);

Output result

arrBegin-->1,2alert(4);arrNew-->1,2,3,4joinStr1--->1,2,3,4]joinStr2--->1234joinStr3--->1.2.3.4

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