Java中的for循环 [英] for loop in Javascript

问题描述

在IE11中不起作用.我可以将其替换为(让x进入a)吗?

for (let x of a) does not work in IE11. Can I replace it by for (let x in a) ?

for (let key in a) {  
    s += key + ": " + a[key];  
    s += "<br />";  
    }  

for (let key of a) {  
    s += key + ": " + a[key];  
    s += "<br />";  
    }  

IE11尚不支持

推荐答案

for...of.

由于具有IE6的支持，因此可以使用for..in进行迭代.

You can use for..in to iterate over as it has the support from IE6.

如果只想添加key和value，则可以使用Object.keys并构建所需的字符串.

If you just want to add the key and value, you can use Object.keys and build the string that is needed.

let f = '';
let s = '';
let a = {
  firstName: 'Hello',
  lastName: 'JS',
  address: 'ecma'
};

for(let key in a) {
  s += key + ": " + a[key];
  s += "<br />";
}


Object.keys(a).forEach(function(key) {
  f += key + ": " + a[key];
  f += "<br />";
});

document.querySelector('.for-in').innerHTML = f;
document.querySelector('.object-keys').innerHTML = s;

.for-in {
  border: 1px solid green;
  min-height: 20px;
  padding: 20px;
}

.object-keys {
margin-top: 20px;
  border: 1px solid red;
  min-height: 20px;
  padding: 20px;
}

<div class="for-in">
</div>
<div class="object-keys">
</div>

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