How to write methods without so many "this."?

Question

Are there ways to avoid using this. before each member in the method body?

JavaScript is amazing in many ways, but one thing that makes it hard to read is that you must use this. before every member:

TList.on_key = function(key) {
    if (key == 116) {
        this.sid++;
        if (this.sid > this.items.length - 1) this.sid = this.items.length - 1
        if (this.sid >= this.d + (this.h * this.columns)) this.d++
    }

Would be much easier to read without all those this. :

TList.on_key = function(key) {
    if (key == 116) {
        sid++;
        if (sid > items.length - 1) sid = items.length - 1
        if (sid >= d + (h * columns)) d++
    }

Answer 1

Yes you can by using the "controversial" with statement as long as you're not in "strict mode", where it's prohibited.

TList.on_key = function(key) {
    with(this) {
        if (key == 116) {
            sid++;
            if (sid > items.length - 1) sid = items.length - 1
            if (sid >= d + (h * columns)) d++
        }
    }
}

Be sure to fully learn about it before using it though, as its semantics can catch people off guard.