js 箭头函数

1.箭头函数与function定义函数的写法：

 //function
function fn(a, b){
    return a + b;
}
//arrow function
var foo = (a, b)=>{ return a + b };

        var arrowfn = (a,b)=>{
            return a+b;
        }
        var res = arrowfn(2,3);
        console.log(\’箭头函数测试结果：\’ + res);

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[code]getJSON(\"/post/1.json\").then(function(post) {return getJSON(post.commentURL);}).then(function funcA(comments) {console.log(\"resolved: \", comments);}, function funcB(err){console.log(\"rejected: \", err);});getJSON(\"/post/1.json\").then(post => getJSON(post.commentURL)).then(comments => console.log(\"resolved: \", comments),err => console.log(\"rejected: \", err));

getJSON(\”/post/1.json\”).then(function(post) {
  return getJSON(post.commentURL);
}).then(function funcA(comments) {
  console.log(\”resolved: \”, comments);
}, function funcB(err){
  console.log(\”rejected: \”, err);
});

getJSON(\”/post/1.json\”).then(
  post => getJSON(post.commentURL)
).then(
  comments => console.log(\”resolved: \”, comments),
  err => console.log(\”rejected: \”, err)
);