missing ) after formal parameters (Javascript)

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A parameter’s default value cannot be defined in the parameter list. Instead, you have to declare the parameter and then set its default value in the function body, like this:

init : function(variable1, variable2, variable3) {
    variable1 = variable1 || "";
    variable2 = variable2 || "";
    variable3 = variable3 || "";
}

This code uses a shorthand syntax to give each parameter a default value if a value was not passed to a parameter. It is functionally equivalent to the following:

init : function(variable1, variable2, variable3) {
    if (!variable1) {
        variable1 = "";
    }

    if (!variable2) {
        variable2 = "";
    }

    if (!variable3) {
        variable3 = "";
    }
}