字符串拼接用逗号隔开的四种方法

字符串拼接在项目开发的过程中非常常见，接下来介绍4种拼接方式

1、简单粗暴法

"A"+","+'B'+","+"C"+","

2、ES6反引号

let all = `${A},${B},${C}`

3、jion()

let all = [A,B,C].join(",")

4、map()

form:{A,B,C}

let all = object.keys(this.form).map(key=>this.form[key]).join(",")