Question

我有这种格式的JS数组，我想获取diff中的所有键。变量和diff变量中的值。这是我的代码，我试图在差异中获取键和值。变量。

<script>
var testVar = [ {ANUMBER: "new message"}, {ANUMBER: "new message number"},  {ANUMBER: "new message email "},{AMDL: "new message"}];

        for (var labelkey in testVar){

            if (errorsarr.hasOwnProperty(labelkey)) {

                var val = errorsarr[labelkey];
                //console.log(val);
                console.log(labelkey);


            }

        }
</script>

Answer 1

使用Object.entries()函数，您可以获得key，value对数组，可以通过for ... of循环进行循环。

var testVar = {1: "first", 2: "second", 3: "third"}

        for (let [key, value] of Object.entries(testVar)){
          console.log(key, value)
        }

Answer 2

首先，您需要两个循环来访问数组对象的每个键，因为testVar是一个数组。第一个循环遍历数组，第二个循环遍历对象。

var testVar = [ {ANUMBER: "new message"}, {ANUMBER: "new message number"},  {ANUMBER: "new message email "},{ANUMBER: "new message"}];
JSON.stringify(testVar);
for( labelkey in testVar){
   var value= testVar[labelkey];
   for( key in value ){
      console.log("Key="+key, "and value="+value[key]);
   }
}

Answer 3

您可以遍历每个元素，并使用Object.entries获取每个对象的键和值。

var testVar = [{ 1: "new message" }, { 2: "new message number" }, { 3: "new message email " }, { 4: "new message" }];
var keys = [];
var values = [];
testVar.forEach(e => {
	var [key, value] = Object.entries(e)[0];
	keys.push(key) && values.push(value)
});
console.log(keys)
console.log(values)

OR

var testVar = [{ 1: "new message" }, { 2: "new message number" }, { 3: "new message email " }, { 4: "new message" }];
var keys =  testVar.map(e =>  Object.entries(e)[0][0]);
var values = testVar.map(e =>  Object.entries(e)[0][1]);
console.log(keys)
console.log(values)

Answer 4

var testVar = [ {ANUMBER: "new message"}, {ANUMBER: "new message number"},  {ANUMBER: "new message email "},{AMDL: "new message"}];

ANUMBER_VALUE = [];
AMDL_VALUE = [];

for(var testvar of testVar){
    for (let [key, value] of Object.entries(testvar)){

        console.log("key: "+key)
        console.log("value: "+value)

        if(key == "ANUMBER"){
          ANUMBER_VALUE.push(value);
        }
        else{
          AMDL_VALUE.push(value);
        }
    }
}
console.log("ANUMBER_VALUE: "+ ANUMBER_VALUE)
console.log("AMDL_VALUE: "+ AMDL_VALUE)

Javascript如何从数组对象中分别获取值和键？

4 个答案: