JS字符串拼接的几种方式(最新推荐)

let a = 'java'
let b = a + 'script'
 
//运行结果：javascript

let a = 'java'
let b = `hello ${a}script`
 
//运行结果：hello javascript

array.join(separator)

let arr = ['hello','java','script']
let str = arr.join(" ")
 
//运行结果：hello java script

string.concat(string1, string2, ..., stringX)

let a = 'java'
let b = 'script'
 
let str = a.concat(b)
 
//运行结果：javascript

let num = 1;
let str = num.toString();
console.log(typeof (str)); //  string类型

String()`函数可以将任何类型的数值转换为字符串，意味着如果值为 `null` 那么转换之后的结果为 `null`，如果值为 `undefined` 那么转换之后的结果为 `undefined
let num = 1
let str=String(num)
console.log(typeof (str)); //  string类型

let num = 1
let str = num + 'num1' + 'num2'
console.log(typeof (str)); // string类型

let s1 = "karim's"
let s2 = 'js'
console.log(s1 + s2) // javascript

let s1 = "java"
let s2 = 'script'
console.log(s1.concat(s2)) // javascript

let s1 = "java"
let s2 = `${s1}script`
console.log(s2) // javascript

join()` 方法将数组作为字符串返回，元素由指定分隔符进行分隔，默认分隔符是 `(,)

let arr=["hello","java","script"]
let str=arr.join('')
console.log(str) // hellojavascript