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javascript当中concat,join,slice用法

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马克java社区
修改2019-10-14 11:28:51
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修改2019-10-14 11:28:51
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文章被收录于专栏:java大数据java大数据

例 1.3(concat,join,slice) <html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"/> <Script> /* 马克-to-win:qixy: Array is a dynamic array. - myArray = new Array(aLength) - myArray = new Array(anItem1, anItem2, anItem3, ...) */ var arr = new Array(1);//arr.length is 1,但是里面的东西是undefined, 所以这样写[undefined] /*虽然arr是个object, 但是里面的东西是undefined*/ document.write("typeof arr is "+typeof(arr)); var a = new Array(2, 6, 5, "a"); document.write("arr.length is "+arr.length+"a.length is "+a.length); var b = new Array(12, 14); arr[0] = "java"; arr[1] = "intel"; arr[2] = "microsoft"; /* Property/method value type: Array object JavaScript syntax: - myArray.concat(someValues, ...) The result of this method is a new array consisting of the original array, plus the concatenation. The values that are passed to the method are added to the end of the array. If arrays are passed, they are flattened and their individual elements added. The method returns an array consisting of the original Array plus the concatenated values. If Array1 contains "AAA", "BBB", "CCC" and Array2 contains "000", "111", "222", then the method call Array1.concat(Array2) will return an array with all the elements in a single collection. The original arrays will be untouched. */ document.write("arr.toString() is " + arr.toString() + "<br>"); //与无参join()方法等同 var arrconcat=arr.concat(a, b); document.write("arr.concat(a,b) is " + arrconcat + "<br>"); /*Array.join() (Method) Concatenate array elements to make a string. Property/method value type: String primitive JavaScript syntax: - myArray.join(aSeparator) Argument list: aSeparator A string to place between array elements as the array is concatenated to form a string. //无参join()方法默认是用逗号连接 */ document.write("arr.join() is " + arr.join() + "<br>"); //无参join()方法默认是用逗号连接 document.write("arr.join(' & ') is " + arr.join(' & ') + "<br>"); /* Array.reverse() (Method) Reverse the order of array elements. Property/method value type: Array object */ document.write("arr.reverse() is " + arr.reverse() + "<br>"); /*Array.sort() (Method) Sort the elements in an array. Property/method value type: Array object JavaScript syntax: - myArray.sort() */

更多请见:https://blog.csdn.net/qq_43650923/article/details/100120352

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