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JS true / false array conversion

2022-07-27 12:38:00 【ray_ zzzzz】

True and false array conversion 

<body>
    <div>a</div>
    <div>a</div>
    <div>a</div>
    <script>
        
        //  Turn a pseudo array into an array 
        let a = document.querySelectorAll('div');   //  This is the pseudo array provided by the system 
        let arr1 = [].slice.call(a);
        console.log(arr1)

        //  Convert a true array into a pseudo array 
        let obj = {
    };
        let arr2 = [1,2,3];     
        [].push.apply(obj,arr2)
        // console.log(obj)
        
		
    </script>
</body>
in addition , There is another way to convert pseudo array to real array , But in IE8 And below will report errors , Therefore, the above method is recommended 
		//  This method can also convert pseudo array to true array , But in IE8 And below will report errors 
        var arr = [];
        var obj = {
    
            0:'ldt',
            1:18,
            2:' Woman ',
            length:3
        };
        [].push.apply(arr,obj);
        // console.log(arr);

Insert picture description here

But this method is used in IE8 And the following can turn the pseudo array of the system into an array 
var a = document.querySelectorAll('div');
var arr = [];
[].push.apply(arr,a);   
console.log(arr);
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