JavaScript Create JavaScript function which cannot be called as constructor? [duplicate] create javascript function with parameters,create javascript function in html,

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Answer:1

You can check if a function was called with new by seeing if it is an instance of itself

function test() {
    if ( this instanceof test ) {
        throw "Oh God no, not a new one !"
    }
}

var a = test(); // success
var b = new test(); // fail

In ES2015 the new.target meta property lets you check directly if new was used to call the method

function test() {
    if (new.target) {
        throw "Oh God no, not a new one !"
    }
}
Answer:2

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