popState:function popState() {
        var n = this.conditionStack.length - 1;
        if (n > 0) {
            return this.conditionStack.pop();
        } else {
            return this.conditionStack[0];
        }
    },
The software constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.