Javascript new does not need to be used again

You do not need to use new array () or [];
Do not use new number, new string, or new Boolean.
Do not use new function to create a function
For example, if you want to write CopyCodeThe Code is as follows: frames [0]. onfocus = new function ("document. bgcolor = 'antiquewhite '")

You should write it like thisCopy codeThe Code is as follows: frames [0]. onfocus = function () {document. bgcolor = 'antiquewhite ';};,

The second method allows the compiler to view the function body as soon as possible. Check the error as soon as possible.
When you write
JS CodeCopy codeThe Code is as follows: myobj = new function (){
This. type = 'core ';
};

In this way
JS CodeCopy codeThe Code is as follows: myobj = {
Type: 'core'
};