Js array commonly used API

var color = [“red”,”green”,”blue”];

var color2 = [“yellow”,”black”,”brown”];

var color3 = color.concat(color2); // concat is the content of the array passed in the parameter spliced ​​after the caller,不修改原数组

var color4 = color.toString();// Arrays are converted to comma-connected strings

var color5 = color.join(‘+’);// Convert data to a string concatenated with parameters

var color6 = “red,green+blue”;

var color7 = color6.split(‘+’);// Convert a string to an array by argument

console.log(color); // [“red”, “green”, “blue”]

console.log(color2); // [“yellow”, “black”, “brown”]

console.log(color3); // [“red”, “green”, “blue”, “yellow”, “black”, “brown”]

console.log(color4); // red,green,blue

console.log(color5); // red+green+blue

console.log(color7); // [“red,green”, “blue”]

// slice() copy a piece of the original array,From the start position of the start parameter,to the end of the parameter, 不包括结束位置, 不改变原数组

var arr = [{“name”: “aa”}, {“age”: 12}];

console.log(arr.slice(1, 2)); // [{“age”: 12}]

console.log(arr); // [{“name”: “aa”}, {“age”: 12}]

// splice() Truncate a segment of the original array and return a new array, 修改原数组, [起始下标, 切割个数]

var arr1 = [1,2,3];

console.log(arr1.splice(0,2)); // [1, 2]

console.log(arr1) // [3]

// reverse() 反转数组 改变原数组

var arr2 = [1,5,4];

var arr22 = arr2.reverse();

console.log(arr22); // [4, 5, 1]

console.log(arr2); // [4, 5, 1]