将JavaScript ES6函数转换为ES3

Question

我有一个数组，成功地转换成带有EcmaScript-6函数的字符串格式。但是，我如何使用EcmaScript-3来完成这个任务呢？接收端点需要一个ES3函数。

原始数组：

formdata: [
    1: {name: "gender", value: "F", focus: 0, type: "radio"}
    2: {name: "firstname", value: "empty", focus: 0, type: "text"}
    3: {name: "lastname", value: "empty", focus: 0, type: "text"}
    4: {name: "birthday", value: "empty", focus: 0, type: "text"}
    5: {name: "street", value: "empty", focus: 0, type: "text"}
    6: {name: "streetNo", value: "empty", focus: 0, type: "text"}
]

必需的字符串格式

let formdata = gender.radio|F|0;firstName.text|empty|1;lastName.text|empty|0;street.text|empty|0;houseNumber.text|empty|0;zip.text|empty|0;city.text|empty|0;country.select-one|de|0;birthdate-day.text|empty|0;birthdate-month.text|empty|0;birthdate-year.text|empty|0;email.email|empty|0;code.text|filled_out|0

我的工作解决方案与ES6:

let res = formdata.map(({name,value,focus,type}) => `${name}.${type}|${value}|${focus}`).join(';')

关于转换为ES3:的看法

var res = formdata.map(({name,value,focus,type}) { 
  ("name" + "." + "type" + "|" + "value" + "focus").join(;)
}

这个解决方案显然不起作用，而且我也不确定它是否有效的ES3 JavaScript。

谢谢!

Answer 1

ES3尝试中的问题：

• 箭头函数缺少箭头，但也是语法中的一个ES6添加项。
• .join(;)是无效的JavaScript。.join(";")是。
• 在ES6中引入了析构语法
• .map是在ES5中引入的
• 你需要再来一次“”

所以：

​

var formdata = [{name: "gender", value: "F", focus: 0, type: "radio"},{name: "firstname", value: "empty", focus: 0, type: "text"},{name: "lastname", value: "empty", focus: 0, type: "text"},    {name: "birthday", value: "empty", focus: 0, type: "text"},{name: "street", value: "empty", focus: 0, type: "text"},{name: "streetNo", value: "empty", focus: 0, type: "text"},];

var arr = [];
for (var i = 0; i < formdata.length; i++) {
    var elem = formdata[i];
    arr.push(elem.name + "." + elem.type + "|" + elem.value + "|" + elem.focus);
}
var str = arr.join(";");

console.log(str);

​